Malicious PDF — malware analysis report

Static analysis result for SHA-256 249107a2b966e588…

MALICIOUS

PDF

78.1 KB Created: 2021-06-14 21:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eede0d490285a0fee123f8509a0d569 SHA-1: 84fbbc5f405661447a2bd1342821a48875058c62 SHA-256: 249107a2b966e588c992ae921e0415e623a0e94237a68bedf4d97880780e3359
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to other sites. Heuristics suggest these sites may be compromised or disposable, and ClamAV detection confirms a malicious classification. The ML classifier also flagged the PDF with high confidence. The embedded content appears to be obfuscated or corrupted, preventing a detailed analysis of its specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

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://laborke.ru/uplcv?utm_term=ppt+template+free+download+pastel
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a3c7384549a1609bdb7c82928f43cc50/devaxowuporogoko.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/174b5640511b2f2ceece576830cc34dd/88379478574.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72e80fb1d---jesekoditimajewegegawaro.pdf
    • http://rld-carbon.ru/file/56166487088.pdf
    • https://acronimocostanzo.com/userfiles/file/xururafenoneruxalogavabif.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/t4sosa58beuri8kphag4pduefo/6132574554.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93ba32450---fadaxetopulad.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9c37b165e1badebbd4d242d55009d0d8/gelef.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16082acad6a2ff---zafopox.pdf
    • https://maxflowfans.com/userfiles/file/reger.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943755911d1---98899994528.pdf
    • http://garderoba.sk/images/_file/84656256233.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab740c56851---46131872505.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0nmhr5lfc1kpfc81dm3j9t5hvl/zakexasixadu.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160749e464aaad---78974867800.pdf
    • http://agcslohian.com/userfiles/file/12102886775.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/1hkqe4qtcuvt3djpcqbr281e7m/1643314555.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_off00011409.bin
dddeb719fded07c0caf5f421ce78fca53a907ad090199e5b1c021e6c521c95c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 5280 bytes

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