Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d3d0b362cdc0fe…

MALICIOUS

PDF

89.2 KB Created: 2021-07-21 12:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62af012b0c8b957fce0d35ace913b619 SHA-1: a36c38c43813409db4e0cf6d20497672e7aaef7d SHA-256: 99d3d0b362cdc0fe1bab6ae4ac81d29d259dd4954206812327f24d7799ed751b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm that points to compromised WordPress upload directories and other potentially untrusted hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5g91j8mra1ior4nbov1aakpf92/63043947893.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fcbc6d1b---tevumiteke.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/gosuzefimile.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zewibasatumaruwasiredorod.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/fuvalipinijemuzuxigodat.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/puvefifelavor.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d799c8bf1de7ee017ba68b5c6fd63d98/18092815539.pdfIn PDF document text
    • http://kaies.net/upfiles/2107170849207068694d42r1.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59f7e9e34---22427953238.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fc3e8fa8---fumagifusigusonamode.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943a41e590---dulirexitudirujet.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/67684949409.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/793963171b53337cf3b9054a1e29839f/keponewajavugowekiji.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/vefarepukakibakoza.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/7494400195.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/nulorarazivizivitikexeje.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/mixanikukikamopezaj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8707df96---78815900579.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/83046269528.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/6455451744.pdfIn PDF document text
    • http://fittbike.hu/files/file/21431217852.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/24256234732.pdfIn PDF document text
    • https://cristalensi.com/public/File/28701590490.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/50647983656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dnd+5e+weapons+tablePDF 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_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 16816 bytes
SHA-256: f70f0cfc05e11289fda74227487f0de3b8351515322ed0135eefc2b790ec99f9
font_01_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 10552 bytes
SHA-256: dce1b0a3ec2cabaff5db4861e1b3548dd923c5da9158bc933dc62ad7cf8f0efa

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