Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e73d2561380a525…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 16:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03cf3033cf96f34ccaff1c7d24ee5fc8 SHA-1: 2bb53c5b1519d58d364cf5a099199b7a3c79a2f5 SHA-256: 7e73d2561380a525155da9f0e5ed24cda615fb00cb96cc5f03a1d882759de770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute or host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/12136f8220e14588dfb4c8394e6df207/wogazavat.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/vibijutugeterudumamelaju.pdf
    • http://hunicorn.hu/userfiles/file/12746972894.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tivelevesigawaxutubov.pdf
    • https://sssmri.com/ckfinder/userfiles/files/lupakazedobe.pdf
    • http://klgd.spokoino.ru/i/upload/files/58224006003.pdf
    • http://studio5r.com/userfiles/files/zokokev.pdf
    • http://georgewongdesign.com/gwd/upload/files/begufal.pdf
    • http://nofatrans-int.com/userfiles/file/duwozu.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/mupumavajutexisup.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/wizunowotiwuw.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137644b5caad---40983423651.pdf
    • https://kfmaccounting.com/webroot/img/content/files/molukirevumodidigirirol.pdf
    • https://villadelauca.com/userfiles/file/35593425353.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95kmn44ocokupqnapntf0c1l14/43083391875.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1158b4fa5---82281808193.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/welajalivujibut.pdf
    • https://viettincapital.vn/upload/files/38176552282.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/gejikomaxagotusures.pdf
    • http://mmbc.cz/_data/user_files/file/93149165888.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/dozaxesuwujofomozag.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3hv5sujfp050kt7r7fd6tkq3k/jogufi.pdf
    • http://lobanowscy.pl/userfiles/file/31511292382.pdf
    • http://ehomerealestate.org/images/file/71134457207.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+stop+pc+freezing+when+gaming
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 16792 bytes
font_01_sfnt_off0000c7dc.bin
58ede5c755aa401e9369145072937b1030dfa6aee034ddb1065617a06bd56863
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 11016 bytes
font_02_sfnt_off0000e15c.bin
365f5c3032642be807b2cdf2eed6b8892d843134d89535ff071c2aebcc44c66e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 14484 bytes