Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf08df4f7acf1ca…

MALICIOUS

PDF

76.3 KB Created: 2021-05-22 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 493e794d8727e7ab2c9e307e1f6b7659 SHA-1: ec2aa116bd382dd8da0fe85362df0fd3fadb3eea SHA-256: edf08df4f7acf1cab46de74949d6133d5511f6d487c256ad47fa23ecde009d2c
154 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users into clicking malicious links, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://coretry.ru/uplcv?utm_term=mentors+admission+book+pdf
    • https://arhometutor.com/userfiles/file/72054214767.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/993635239bef8330a9d05852f9002d00/66496359663.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tamiwakepef.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a4708ade0---pogepapu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823cc0a2cd7---kikobirif.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fca0bf6ea---lamofijomupivubutesifer.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1d8a779695245d7365ef1484ef974954/44903382608.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd550c475---zinobegamowigawup.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0cb4bb1f---12563198374.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/naxamowalelefebadaji.pdf
    • http://adance0112.com/upfile/editor/file/tokavon.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/857cc3ded39f9b02dc1410bb1f244023/dirabaj.pdf
    • https://menlopark.com/wysiwygfiles/file/nogimosesijifedisov.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2fb20c76---9069649654.pdf
    • http://gyobel.itpublic/file/xidikud.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_off0000f492.bin
c9958a57eec2a156723005682c7aee4a848cc2b82e7ea964b998e12afb396de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 5364 bytes

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