Malicious PDF — malware analysis report

Static analysis result for SHA-256 a921b89c108eb92e…

MALICIOUS

PDF

68.6 KB Created: 2021-06-09 17:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ba4ccd2138218e295f4fbe5af57a27 SHA-1: 2a0fe3862eb3fc4de43c9f77a074b5db8488a8c5 SHA-256: a921b89c108eb92e026ed1ee3e8841041ead6f1645980afa617b6baf333a5167
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. 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 embedded URLs are indicative of techniques used to deliver malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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=ba+pass+telugu+movie+watch+online
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acef2915aac---betopaxepinixiwepakenat.pdf
    • http://diversecityuk.com/userfiles/file/tipixagiseviti.pdf
    • http://traiteur-ribot.fr/userfiles/file/6923200008.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a20cb179b5b628858f2bf405879003dd/jutuziralivixisu.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589efb48cd---rugiviwufomo.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf171ae2a---94664752740.pdf
    • http://lyshiying.com/d/files/43052899573.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9922d35f8---87704124873.pdf
    • http://www.aluvascientific.com/UserFiles/file/kirupexunaxuxowuvazuxilil.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eff2e3395---lolajevomasipototep.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/632461a7ae9f9c92b8490c1f728a3671/96128861156.pdf
    • https://108pizza.pl/uploads/userfiles/files/vexokaninimek.pdf
    • https://tort-art.ru/userfiles/file/tumekotuvazeneso.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee68216fb---lirepikisawuvoris.pdf
    • http://paoladebenedetti.eu/userfiles/files/rodunenezagaxisuganimot.pdf
    • http://pantryscan.com/123cars/imagefck/file/vazebepuxovoganuwexeti.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_off0000f430.bin
1ba8d90ad04796d2749ef88141bdc99fd22b831cb9ef2ea9f7cdf59c484c7bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 5452 bytes

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