Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb0d2a8c9402bb7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4ca3340fd8cf8fbe52349bb3c4ef87f SHA-1: 5be20c0b6627680f8d8e7fe23790d52d77d3ae44 SHA-256: 9bb0d2a8c9402bb7a03cd5632d7557d98d52258d7f068c10723d4a62ac65d332
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bomando.bomsolar.com/uploadfiles/files/73926260118.pdf In PDF document text
    • http://a2hgghk.handylover.com/upload/files/waloja.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/6262498628.pdfIn PDF document text
    • http://gptools.net/userfiles/file/tesubakuz.pdfIn PDF document text
    • http://pneusmarene.it/images/file/7879901771.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901144851_i0vbkz.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/71408292525.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e40634d1---67165351407.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceeb91c52---40521899885.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wuxodefejo.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/94703774038.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/rifebejikikepubov.pdfIn PDF document text
    • http://pvvc.cz/files/97730504532.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/30a5fecaefa1ceb03e861c8e507fedea/foxisudelupugurox.pdfIn PDF document text
    • http://centromp.it/userfiles/files/18361344712.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kodimajerisufipufevunim.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/692574526.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/13095740962.pdfIn PDF document text
    • https://priscar.com/documents/files/vuwipegiranaruweju.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47fa47812---jitudedutotutulolenono.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/ragoturapiwavitoji.pdfIn PDF document text
    • https://negaratoto.com/contents/files/27061493369.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/wetakuxalik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=digital+marketing+fundamentals+from+strategy+to+roi+pdfPDF 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 11148 bytes
SHA-256: 58f67c675fbe7e9920a1b0ced923974e35c1f5569a9ff4cce85871e63f611bd2
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 14592 bytes
SHA-256: 8d5558b3a69bf21cedeb6dbc16829f9d2c637b8f1f78b120b87bf91a359a7371
font_02_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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