Malicious PDF — malware analysis report

Static analysis result for SHA-256 7352562be1be7057…

MALICIOUS

PDF

64.0 KB Created: 2021-06-20 19:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae7f8a636f1aef74f8ec5335e6abf271 SHA-1: 6fc6f9d3edfc13b69e34e5a8f47872683f53d6a0 SHA-256: 7352562be1be7057a70c44af732163c97183c5218627494ebd5d84027c3bc9ab
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and link farm structure are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=summer+of+69+acoustic+chords
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/riwekusalizimebe.pdf
    • http://www.look4job.gr/images/_user_na/file/kikenal.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/67bdd54181f803cc0de3cffcde1a1a44/rufekumobetuvojonidino.pdf
    • http://pdww.ru/ckfinder/userfiles/files/zogebogizemusoruxineg.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/xerokuwejedetitakusosi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bfbbc2981---49275833277.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4c4501cc4cf74a623cb77430f9b44542/noroxur.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b9ce60143e15806d4b4d37e2ef7e9e08/588381117.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/nuzaberijurozaligoligoma.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbad7229f---tadevivetabutaz.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904389f38e---76561647012.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215251541275323.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0945e4d5de---puluz.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248e49ca50---vojalawib.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e7357ee4---sidafevew.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/59255110771.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c9572512---1356147022.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c265ea1649---30539957779.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p6r4uq7do02tt1gspd28vvuoah/13504957495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97a.bin
b3e38357752a740d8e0189ca01a85cde925041d6de3ac3e6bfe925106a2f7db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 5644 bytes

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