Malicious PDF — malware analysis report

Static analysis result for SHA-256 e954f36385bc3943…

MALICIOUS

PDF

75.0 KB Created: 2021-07-18 22:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 562e85dea48e0baca66c1b1127c8e885 SHA-1: 5d74f4c3febc872f7f7fe35de2ad305b55327464 SHA-256: e954f36385bc3943aa3ac88e7567ea232e42c0b97991fed3148a2b1f60af68e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d5c3140c---91853116372.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1fejddo74tbno4umlstso5uaf5/49085180026.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/20967701360.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5af262feb9747ffa55a6060bf8148fce/fovejapipokufu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/486669147.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/89647235632.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6f38390e45a59f1589fca9ab980e8d72/27315741767.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8c069fc97cdf53dbb8fb4ca2d1b14aa/43872488652.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf909f2a8---9915947753.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160801047c77fc---7033915592.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76786120944.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641fa8e7ad---ludakufede.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/4427228658.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/23438646688.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b79084cb4---xewemefe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8b3e20df9e0e506f16f537e541b8a531/xipegefezabidovofu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/68468423237.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777289a65b0---jugaxoxekizuzalezurulelot.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/55001911495.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pivikukari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=old+muscle+carsPDF link annotation
    • 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_off0000c451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC451 16896 bytes
SHA-256: 650882e1b16b51a0b1013d66238976d90d0321d32bb903b750f1d58c6b453658
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10244 bytes
SHA-256: 2ec2e481c22db7481c4f2026fdde91a18d37a679cfc2cfbc24e5ac25f28a5b00

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