Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd857b240fa46d9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8d38f22c15ff7194475c76d9ec5d524 SHA-1: 1659d47e215dce34d51456d67f70d663c992b732 SHA-256: 6dd857b240fa46d9aa59fca47315d11c502c8df5d230cb6086ac5e83deed1da2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised or disposable domains. The presence of a 'Password-protected archive lure' heuristic suggests the document may be designed to trick users into providing credentials or downloading an encrypted payload, which is then intended to be decrypted with a provided password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=descargar+troyano+para+espiar+android PDF link annotation
    • http://vetsnab32.ru/userfiles/file/50328760822.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nawikudimebipu.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/80459063473.pdfIn PDF document text
    • http://sushibelovo.ru/files/35435226425.pdfIn PDF document text
    • https://etadelloro.it/images/file/vusuxegenevizezudiwegapeb.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/jepimozabuveziwunese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2c6db93---nefuzosemetonob.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3e53051e---rurubugewitib.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ca8b3038---terufoxojatu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c1cd4669---55046381670.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/52838494735.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/28786437277.pdfIn PDF document text
    • https://network-italia.com/file/42497490822.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/27871514859.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/43021658504.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/firosemejam.pdfIn PDF document text
    • http://skupka54.ru/upload/m/xobufediboguwulezeg.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/wovepez.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/92195540483.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd49bc3da7---kabave.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/991525397613068e8f2cac.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/84108480583.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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 10760 bytes
SHA-256: cabdde81d9807f36fd23eef5bf7dc63e3336bb649f4891f57289c0731508d808
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 19024 bytes
SHA-256: 39cf18a6b413bdf7f728535c0461171ed20059cacb8b32c5ebb2ccc0b31c830d

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