Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421c0e03dd39ecf…

MALICIOUS

PDF

47.5 KB Created: 2021-05-25 06:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bfdfdf441b898116cc937ff2343bfb2b SHA-1: a2cb975e3970177370f72cda0d16bbe1280686e5 SHA-256: d421c0e03dd39ecfcdf9792d2aad4db20671b83d4197d8d6eb91b228cdd2ab6b
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8572

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://allytemp.ru/uplcv?utm_term=how+to+fix+a+kohler+shower+handle PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9008bf16---37654540717.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac411f2a4ba---32551896225.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbac158163---mexofan.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/5aaee681c7e5a2560115e318276ac94f/98302671237.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/45646044492.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/95634523002.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qlgktesql2j47uhfvn7lad26rs/45133839867.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f2159e62---xiganuzumoloveleroze.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wijasinomusujifiravisaj.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086707aaa7ae---23877153967.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d435b3de86---6033811478.pdfIn PDF document text
    • http://bwc.lt/i/kubamowaz.pdfIn PDF document text
    • http://coffee33.ru/archive/file/votolixaperug.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4589423c4cbfa857f20660089defe556/funabemew.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lutaxujoru.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0e2775a0---saworekujubuxuxufumalatok.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/66d81c72b23f5d8db05233cd4a205d19/belorev.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/xejiberolumofukasubof.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2c3jprpsmaa6bb3msf81a4crrc/tikuk.pdfIn PDF document text

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