Malicious PDF — malware analysis report

Static analysis result for SHA-256 f886ec263273a222…

MALICIOUS

PDF

81.6 KB Created: 2021-06-08 19:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aab882f2d3ddaf755cbe3d9b71550db SHA-1: 9f672dcbc104f36c4d63709bac8f2d890da18a2a SHA-256: f886ec263273a22281c5d0cc9b0638b7313b11b2d92f4d772b1a88c0e03ad39a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=march+2021+calendar+template+word
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82f31138c---miridademadipibedijo.pdf
    • http://cy2hand.com/userfiles/fowesidimasefaluko.pdf
    • https://bselink.com/userfiles/file/65650747401.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7561e69---xaverugapuselad.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096256719cc0---zafowufuvano.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d226923fa4---78818801460.pdf
    • https://afra24.com/basefile/afra24/files/vijagedop.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d8b2600---gelibarejapefini.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607295d98287c---69687533913.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a6a5efecd79af411b0c96e280fdb4dc7/vabak.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a59060663e8219a38b211f67a3a47811/49843633720.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21848a7a0d---29033457018.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/31404772a5e54e96bde8ae4c1588c469/naderolexobetonusez.pdf
    • http://allprintusa.com/admin/images/file/vewuwonakivisij.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f7b61ecb---pufedizibojovumadefexel.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/fg35csg426cnfqf7dpcjh4i85q/14932716847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c8.bin
ab128276312fbd4b6b8730f04007830ce103149ba26540f437ff03936270363a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 5560 bytes
font_01_sfnt_off000114a2.bin
c2e507b38bf1d6b15e2746cbf75b21bc040a421967d29b4261031071f8dd3fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10868 bytes

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