Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78ca2a3c9ef6ceb…

MALICIOUS

PDF

60.2 KB Created: 2021-06-04 05:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 494ceda900b9c3af520d93813d42919b SHA-1: e4e57aa40553608036d6dd5320656870968c6cbd SHA-256: d78ca2a3c9ef6ceba6c487bea885ae5969fb03ec417b3ab956aab516247a0910
154 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users searching for academic materials. The embedded URLs and the nature of the link farm suggest an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/765931fd8cfc4d77754551d6666a4d87/93239090241.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bd38b6636509c55a8bcfa4a319420f7/90275535473.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/34a8f93f31dbec0f031d9241264f245d/wigofowujasinarebapu.pdf
    • http://espacioschillout.es/images/admin/file/3228890586.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ca536451---7743256944.pdf
    • https://atphp.ch/userfiles/file/maxoxilizufadajorute.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/312198938553fcf91678da10129d95cd/80510312042.pdf
    • http://penzionklara.cz/userfiles/file/gotobu.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/nakuvotusebepuwodalose.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/491lf2f1vhlpb1i2ebokj0qpia/garumoduferuwuronamemaxof.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf5c94340---22115310245.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/oat7bnl4pq3h7nndh63a1q3v10/25434626152.pdf
    • http://www.aluvascientific.com/UserFiles/file/lovakosisavaxob.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb478d8819---88510175023.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uth2k2q5jm5q5u6ba563sdglp8/53684894387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hibbeler+statics+14th+edition+solution+manual+pdf+free+download
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb7.bin
1f4294d8211fe5828a0c998a65fae32c59c24d201986168beeda6d41644fa9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 5728 bytes

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