Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bfd71d56d07cee…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 11:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ff37d0e225d746fc3088c452913032d SHA-1: 4976762e16729bd1c97dd32b6c15e7f442f3c7eb SHA-256: 78bfd71d56d07cee573a46e0e485326e9bc4e4057526286708524356284d36be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement or disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5264

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=developmental+psychology+lecture+notes+pdf PDF link annotation
    • http://stringpoets.com/userfiles/file/gexutiraw.pdfIn PDF document text
    • http://mrybalko.ru/files/takikafi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16077630a42944---13467095994.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a55c1b23e---ritar.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ift0ouo7vsmoi6nskksmjcqqi4/sofikinimofoxepolutejugi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81e57516b---39075401442.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6835d429197667c70b82d72839f2f481/gavenusemijafeta.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/30635461412.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/64846787868.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/23958948976.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/78867617714.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kedizaxudoduwubi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/934ce9c25093bf09b53b8622162e1a28/lexilojigipuj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vsqhk45c8neftak51f1869stqk/tikajebakowuzevilebon.pdfIn PDF document text
    • http://maxbrio.kr/files/files/walodi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbad9abd6d---48320527709.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/tejulig.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fakeja.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/71653466667.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/55591978415.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/zevaxivupenevubijimupaxuj.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161122f277dc3d---53192573954.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/vosedoxilisokexegutosose.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d0571596---jowedomekuwovixilagixifuj.pdfIn PDF document text

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