Malicious PDF — malware analysis report

Static analysis result for SHA-256 739db44a6c2c33c6…

MALICIOUS

PDF

63.7 KB Created: 2021-05-27 20:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d2f23cecd8bfdcce250eed4aaef5a51 SHA-1: ebc58c211cfd7b956d68982a37afca4d24c26845 SHA-256: 739db44a6c2c33c6bf0675b9b0f96e43d423eeb45b605ac2b79abd8c660f7dfd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential tracking/phishing aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8680

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://oniceh.ru/uplcv?utm_term=solving+absolute+value+inequalities+worksheet+algebra+2+answers
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/80fd88fbd3135ea5875361fdb9e68dbf/49487808716.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce684c128---magorevutixipovefakov.pdf
    • https://diedacorporation.net/freesiafiles/file/tukis.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f12743f3---bekutefo.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c280f5efa56240f35bda012f77b7c911/wesukajuzejijetagudexoned.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c815e6ccca---puzisasanosivupibopired.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b4cbe0e96fb0468941bc7dca8359/38652609612.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdb56b63e---50242328576.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/81v2igu1gqd3olv3hq6fkougih/sunufubusomom.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/epihjs9ohb96q33saoh6fom17c/zinufe.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c4560faf737d79ed3323c3145658033f/jepedajega.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/94126c8347b8241fa083330b2e34248e/junure.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ok6eheop5egkpikbn0sf7vu284/9016647176.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1b523172---morugariguxuriluva.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0daa9b7ad---27506714976.pdf
    • http://nitexprofi.cz/userfiles/file/92809577286.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_off0000d6cb.bin
e9ff7e141ce6d64cd39590c6039cd11466f83710117cdda5066ddc167f02e9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 5664 bytes

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