Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3c9b844deda0ff…

MALICIOUS

PDF

59.5 KB Created: 2021-09-05 17:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d0ee3e2704a839cf04ecc9cbb56b338 SHA-1: 77a54369fe33f36c05cd2a6d461274eae79506c0 SHA-256: 8a3c9b844deda0ff36977374aa06570ea0a4a25033410b4e3708c45d2a14bf26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals a high number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a phishing or malware distribution campaign. The PDF structure and link farm characteristics suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3715

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=research+paper+example+pdf PDF link annotation
    • http://erpos.sk/data/files/41940712231.pdfIn PDF document text
    • https://proxus.nl/file/55017067932.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/nt0qlg5npdie6a66dso0od6kno/17706353351.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/46264274164.pdfIn PDF document text
    • http://limoride.net/gallery/file/68702964870.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/31551371431.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/68616543959.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af65e6fbd---gezituwupulepuwo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fepagaxikememibe.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/bexozawawejesunuxenew.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/dawudesipageg.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/buzarivurivulipewujuzobe.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/zovubivef.pdfIn PDF document text
    • http://gotween.com/userfiles/file///norasibi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17617214718.pdfIn PDF document text
    • http://geoman.cz/data/file/sokese.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a2449c32---jakijidiboxef.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072021370947.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3a5347c4d---91661454388.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pe5j4haekasjcdcpv7knml9q1/5627801511.pdfIn PDF document text
    • http://billsky.ee/files/file/24930698727.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/dininobakuwuvegejon.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/timosorogepa.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/59692514703.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/83699643214.pdfIn PDF document text

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