Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eb668d1652381f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 02:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9bb6f5ee68de4f10169d98621acbdcc SHA-1: 04eaeb3ae47972ed7447e1623e665e5f6d0e9f23 SHA-256: a9eb668d1652381f60608b0b7b6caf671c83756489ec740bc941d71c2db04731
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=introduction+of+depression+pdf PDF link annotation
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160834e9471748---55765640444.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d196ba8694---ketusutuz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3bef0792f1412f8717fd1d4411c99fca/3748597258.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ciuuc197hl7bvomdis3adbmbm5/kexawifelifojugarefe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093264b992c5---zeziwelamavubajede.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a142c89e9---17437246141.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vebuwiwuzozuba.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78e1054b6d3a861ffdb238a715a2f78c/93499769285.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/59980863090.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff45ca2cd---85273829135.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/58825232438.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6643d09e---94955557110.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0afeecc4f---40388276891.pdfIn PDF document text
    • https://cristalensi.com/public/File/pitilemagukuveguginow.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/32743932901.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db77a4507---monofajozej.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duvamor.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gforf8mpadjtm5rpmf6s6d1n74/siruzegikafofam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ceb35424---xewozedotoditonum.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6cd2c5d7293640608811bafbab00ada4/fezerinojimom.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/12be0b7f77632b978f8d6f7ce1dbd5e3/satebid.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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 17076 bytes
SHA-256: 5468c62c57644d40c4a0a0a44b931c56b6d25c7365b590a88008973eed28f894
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 10456 bytes
SHA-256: 32614c1ebc7e5078a06c5cc84948ad8adad1c641f1d337ccafb782a36fc5a14a
font_02_sfnt_off000135be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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