Malicious PDF — malware analysis report

Static analysis result for SHA-256 849c6ae29a1b1223…

MALICIOUS

PDF

71.2 KB Created: 2021-06-05 17:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff55c98dbf1a3cc4a5ca2f249b0f51ba SHA-1: 456f45a306a35b19dc4b11d720128538cc410515 SHA-256: 849c6ae29a1b1223787f3b3279d5d0b1ad031500d9974724195e653316f70b93
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to game cheats, likely intended to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://crewmak.ru/uplcv?utm_term=wordscapes+in+bloom+cheats+and+answers
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/97318dcdf84e8d1ed41d18b1e9775798/woxuzekusinasetegiwuvuk.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d38f431c959cdfc340e516e0af35535/92522771504.pdf
    • http://xedaptap.net/userfiles/file/xivapakulupo.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607067cbe847d---41658757388.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/91a5bdae52c7f159d3c50387b3b5e689/64476267762.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/81ed9d81f001862c1b7747b82d349c24/16700468463.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623a6a920a---84404561862.pdf
    • https://digireg.dk/upload/xomaki.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a6bb17cd7d6c32adc1b3a6add7bde5ab/mofikasoxamiru.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c5ed3f38b---74323586984.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a422c88711---sisojoxova.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b5ddc03cc91764f2fe1ed4e9f81a24c5/fajujeturirutirep.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7e4c3940072dd2059ddefffde486ae19/fowipurukewojomipow.pdf
    • http://abc-tel.ru/data/File/69024041970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb65.bin
8d47cd53286c63a165e909966fb2cec9e33722368c23afa5f953654d03011b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 5344 bytes
font_01_sfnt_off0000dd67.bin
b58bc1ac19afb53de95ec3e20e7239774e72f977697d7d7bc88bca8b93ffa629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 10916 bytes
font_02_sfnt_off000101b8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 4324 bytes

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