Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda07c02ccd5a602…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 42bec1eea687945a0b7fcf332cb292b6 SHA-1: 3a8bbda1d7c237c24fcca4138049286fa3f564a2 SHA-256: fda07c02ccd5a60227fba49a333ada00765a15ea7aaecda6f7503c3ed0a08b92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=aimbot+mod+krunker PDF link annotation
    • http://cck-brno.cz/ckfinder/userfiles/files/todesisu.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/penavax.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/df626afba745fdd18c2d92106518bb0f/xezolalezozuzo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/08463feefdb4a0c23ebf497318a6a4bf/rojakiwutew.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/83286537355.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lemefodaxufotidufemizu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pivokider.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zomizitawutaxesanozive.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/37156304697.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/bexusibokudexugeromoribo.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/koxazasevuboveri.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jomukoxemajexuri.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/16333962051.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/vodurozoto.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/panutigeregolejalen.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c800434bc2---pitomoworavidagunew.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/zegum.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349700942d3---19818825651.pdfIn PDF document text
    • https://rotitelor.com/contents/files/birovejopefasopuvumofeb.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/4392243671.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/15681699551.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59325815273.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 17620 bytes
SHA-256: 9e42b6364d74ddd31ed49b08e86b19c015654f2735363887958a3c18321bdc0d
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10348 bytes
SHA-256: 6a978d472a4e065986f29b3955d81faccc26690858c0a1e285d8c2465fcba63e
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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