Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6ca26056cdb638…

MALICIOUS

PDF

90.6 KB Created: 2021-05-27 19:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd9515817963f6b16d94b50b93065cb SHA-1: 5f333b801c8ef0246ef3d2691f4e0e5882a02a0d SHA-256: eb6ca26056cdb6389a78219b154af51a4c9b760142a89835411d3a80ed5e0e93
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=how+to+calculate+mean+median+mode+of+grouped+data
    • http://www.aadhar-interior.com/userfiles/file/50707071927.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6023aad6e8ced242b66726603cb98caf/57866183259.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff02de3e2d---47755075568.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e35338bbe---midiviwi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3ed83dde---gopawuwasiredokij.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/255500c1dc1a064bdedc617d5620ed5a/podobadunaraj.pdf
    • https://xo-sound.ru/userfiles/file/38495866497.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958aa884257---kefogedos.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a560e91fa---72366916684.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3341b7412---sivabovibafimutuful.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c2e7a3aa845f0e9aefc74c79d2d32982/59068733596.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e99f11476b59c5e1069daed508d90042/pebudefuditatepudasorazip.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rb1vfmo4n5r9ru622begstrija/3997893593.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea301a97f---gibogegudes.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3d988b486e7ed9d87640ec2d78b0991b/fukog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • 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_off00010afa.bin
f69a47547804045a8c1ac369eb7a1ae1b7203791582ac1053c2a8111d3ddccc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 5352 bytes
font_01_sfnt_off00011d2c.bin
5ccb7bc9d775d5e52e2c3d46a71e70729162810cbdd24020e8d769c42e349d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 12432 bytes
font_02_sfnt_off0001479c.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1479C 16164 bytes

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