Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4c59bb0d5071e9…

MALICIOUS

PDF

64.3 KB Created: 2021-05-10 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce0319f078c99358fcb48463a4d30e8 SHA-1: 7658e460cd953f7aeb4d8a3ec094ba4caae56f1e SHA-256: 2c4c59bb0d5071e9a3818b31d23e10b7b2cb69dca07f7283f2a582e3370b1e2a
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fe105a7b---gugosama.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b93b06b2af27e61d3a9842a597ec18cc/mazirapinivinakapobemuzu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbec913e5---zejigowetaraxivole.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a258c1d496b874bb8d5bde0e6e9ddb73/8181443039.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486362319---raxufafenepajugolito.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagupelora.pdf
    • http://beerskiboot.com/img/upload/file/rubodizaxofariremodoge.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/90013aa964a05eeac759686a4541bfa0/45893833010.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db6ebface3c85da0f8d90e9c9ca730e3/vovotomemukajipeluvuviw.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d8f747e042870570e1804716be9b73b1/xujok.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6cd7483e---vagutinibevop.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/64034260d71de331dd155b253ace8eca/39760030427.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3da9b426---zeguxikodugif.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6fd1632b---jiletuxefifukifabal.pdf
    • http://agnieszkapawlik.com/userfiles/file/zuwejupub.pdf
    • http://ghalemdi.com/userfiles/file/zoxekijexun.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab6457d45---23371177504.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc804f1f70---fesogadewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=la+chargers+final+injury+report
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d514.bin
c4e16a8d35551a9728c4db890d45cbb4cb1920f6a01a5d68fd7c78b180b21f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 5396 bytes

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