Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63eeb9a6daa162f…

MALICIOUS

PDF

64.4 KB Created: 2021-06-25 10:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8ef4baf26ee7f0c130521fb14c9a9675 SHA-1: f8bcd507c08eac5c068a85c9b282113c9529946f SHA-256: e63eeb9a6daa162f8dc319e07d9e5da7fca7d7a3f7a5a99bedf6a1d08cc69726
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7d228924d6f2d4afc9ca2940a00780d6/34340838212.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/bepenevigav.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/gobibukezawaxizadovexafep.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2b132ebd---79022806415.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d5a0ded8da70e1ac5e512dd79f62c7ae/2856449527.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/29185349075.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e0247bc3bbfd7cedd045f6e8a9313e24/41879835033.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/64955511897.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/13220220503.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/36b47960a58d9da4b01d7019e185040a/50628433810.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c674ddfd6a04bac8aed5d3021f5be9f0/danusiruwibebukunulu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lawoziwag.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/04be937e85ccaf8f9629a6d91d37ef9f/jibazazibuv.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/wujawudomasilavenenome.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ggrft4qaldm79a3qprkn8m301c/44425122943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=master+gave+dobby+a+sock+dobby+is+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 5528 bytes
SHA-256: 7e1d15d4f2300e7054e7d64b4175f21efd7f951903321a0a56980a60c2d58c9a
font_01_sfnt_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 10952 bytes
SHA-256: 7aeb5c74712bfc81b0e04c4e3f63d1ad198e5f742c6110b71dc812127e674dd5

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