Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ca85a7f2d769ba…

MALICIOUS

PDF

100.9 KB Created: 2021-08-03 05:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7382fff01e27aef6e2cbd779de3f316d SHA-1: 32cd0a7e984676ba428254864299d6912795746a SHA-256: d7ca85a7f2d769bad5ca1227e4a3d79c2cb991e7c457cfeb177086e7a1e08e9e
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious payloads. The presence of multiple compromised hosts and the nature of the links suggest a coordinated effort to host and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bc30bd34---vafixofizewegazuli.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7867d6a32---67812926258.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/97229296133.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6285fcdff68f2160c60c9986236dedf7/15016313573.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28a5361172---vugifudugedanabulamek.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/zeworolapilereturuk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe58265ed5---97702308777.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1de1e5e15---73693067017.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/mumunokifon.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/sotumufusamavenarovoxo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/14576761162.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/281qgd9q47hutf27u8vfm65m5j/bevaxatewijani.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/75180751863.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/35fmtmi4qr71gn5mr0nfbv5cag/beromuxip.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/56798442158.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/60331516547.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4000a4b4a6850a245f7e04814e082a6a/suwovizudagimararor.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a07412673---naluvilodipuk.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qg8t55kasuhetji1pfkantpbt7/16367187182.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8r630lj0tfvv134695r16gpkph/dusimibumawugejon.pdfIn PDF document text
    • http://domario.ru/userfiles/file/votuvu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7d5e4b6f9d5e094928f4f3eaf64708ad/76032223773.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bc2402590a70a34a2586bc2b77d26c02/45627412229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=corrig%C3%A9+crpe+fran%C3%A7ais+2016+groupement+1PDF 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_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 19848 bytes
SHA-256: 7e3b22366ecda117b6a00c148138f71d5cf4469caf9fe0d1022937e0c3b4c958
font_01_sfnt_off00014fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 11720 bytes
SHA-256: b34c537c156c2193296b5d9af9496f0c47de87c8eca10fab73d256e23f920eb8
font_02_sfnt_off00016b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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