Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c5ce731e256cc6…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc5ed3a67a7c09b5dda2733e39eba0b0 SHA-1: 5fb66fdbc840bb6c04e2352dc314f664073c64c9 SHA-256: 21c5ce731e256cc614d254e8ec4d15d82a43d8e4c086a3140be80fd97228ef0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These URLs likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catamma.ru/uplcv?utm_term=posh+policy+pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/be94a0497e36b7bc11e1778677f2a199/3653118622.pdf
    • https://commonwealthsportsawards.com/userfiles/file/75106864018.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/jexorob.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6d2c53c5fa7694ffb2eb14afbb838016/27242539305.pdf
    • http://amirafouad.com/uploaded_files/file/36909117494.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2ab0ca769b241f856b490c604d846249/53301832873.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0mu53s8v20orm3fmtv75p3huu6/70944259353.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/aodq0tpgeh0q2thpiidqivp48b/bixugusoxajatuwetotezataf.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4864896eb1251a552439485f4f37c822/kusaxusaxeratifow.pdf
    • http://dentish.ru/ckfinder/userfiles/files/25832510121.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c0f5ae19732e68ecda5bb561f42c5c4b/varowawifafizagefe.pdf
    • http://diamond6ranch.com/userfiles/file/xalunegafuxekamejukixemar.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/730339c6bfd0b832613387fb951f865c/jeliluwolakub.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/ssgc0mug2f4t1js07sk5fap9bv/73950542618.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa983342---natugotevomupeje.pdf
    • http://ekotop.eu/userfiles/file/5408945589.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db09.bin
14e3748f4f44ca7b430583e8f9572e59dde65e61b09f818a246c5fd46a72339c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10236 bytes
font_01_sfnt_off0000f21a.bin
b282bffc566b7cd724c3cfb8af5692e204cdbaad51ff69bf5531b7749696ec9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 15944 bytes
font_02_sfnt_off00011b39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes

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