Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f128debf858f95f…

MALICIOUS

PDF

147.7 KB Created: 2021-07-10 13:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4485f2f3d6a5d9ef5524e44ef9b27648 SHA-1: c04df7c24b352e3e70449bae5afc8a652b52908e SHA-256: 9f128debf858f95ff20ed379d9540406fefe1e22a8122d970764d3eaf20d172a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading a password-protected file, likely to bypass security filters. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9339

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5911f94fb94aae76a6c25f49fec7c8de/70112215035.pdf In PDF document text
    • http://ekotronic.eu/files/file/juwixo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ndjr8f6hlv303cvcqqv4iqroen/4382187533.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8366786734a279451b0b2aecb7b92c6f/patuzipotox.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/likewukekatibaxopojezuwok.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f03004a21---19933554617.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608547f795bc6---jetowuguvaped.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceb430e16---sadutigunisitodokufapasex.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/kufipuwexaluwuxoguvidi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ab2d4d84---joxadomigu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/toxune.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be02bdb5c2b---wejetifotewepawidadag.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/62addbd1382829df0e00c1de5a44e56d/tunutokebaritigunetebe.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/86649116813.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dfb4ac7---93859780608.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xuxavot.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zeguzadawetalabomutik.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/fuluvavekugumowanipa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f56cea013---xevizuzi.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/92130782395.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i1h339et9pgp8sl3473esvn081/sasotobun.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd1ab3c9fa---5817464882.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfa748385---70125418427.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522083348659.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31d6674c3---98460337829.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed50a0c31856a02112cd41b0de7fd51d/28064565387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=skip+survey+to+download+filePDF link annotation
    • http://irodori.kir.jp/files/file/1853083397.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C628 18860 bytes
SHA-256: 35914d5164f55062089801505c98c540efe6c0e2451aba1da0b39d4ed12675bc
font_01_sfnt_off0001f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FAF 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off00022521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22521 11024 bytes
SHA-256: 400a7a9c81a36698aa6502c3a63b608062f48914531ec4cc9d16b22a58dcf9ed

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