Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4bb66e07a4c4eb…

MALICIOUS

PDF

61.2 KB Created: 2021-06-18 00:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc4b915375f4856ad15f0e9cee8c006 SHA-1: 96620b37668ac0daa355da0e1ed965d60acd7df4 SHA-256: ef4bb66e07a4c4eb4733cc2d8178fa658dc6bf3ba23725b698d1a27acd2478dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://peptidturkiye.com/ckfinder/userfiles/files/87023381700.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0a957f75535baa4d86d55ac7440bde47/28925156758.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7f61c81e---muwamuxogimabisoridej.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4179a250---gogijediv.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c0aa455d---metur.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf6f6337c---rofejilit.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r09d9s2dm8jsnbdlt5otk2mq1m/95226066228.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ba089eb3003204e977d920a6843b812d/15209958138.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4906d27d6---girimufegevisupe.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rr1bjd89id3sfuo35fokutrv7m/10600597086.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0786aec9e---fujonixabebobovigetag.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1e7ba444---1159405936.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b503e3ab9---82952498330.pdf
    • http://alliusie.com/userfiles/file/27023868895.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56789954c---somozinoji.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4ee5b16b4b2a97bf927d48ef90b28ca5/buvarisazi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a7cb2601d7108d50e7e9f2a4ec973b05/sexelapigupul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=good+build+battle+themes
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffc.bin
eed5fb9c7ad540a9d957805922e44645dae422a5443c7a6690cd01a3bfe97416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 5140 bytes
font_01_sfnt_off0000d148.bin
c1494da7110d48f12dfacf7f4df196f638bd0edce0b5688dc84ed79c96351228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 10156 bytes

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