Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fbb671038898e2…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 17:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65b2b89f9fa037e6f37b49944b3a24c9 SHA-1: 40d61cf3621a349adc203a2deba1a8acd341f5c4 SHA-256: d2fbb671038898e29a9cbabd255b633b8b007b85e856db5c0b9bff2570673048
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=peg+4000+solubility
    • http://akinmedikal.com/uploads/file/92864568133.pdf
    • http://www.asslar.de/downloads/49406502823.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3nl8mgh4lf117hsvnegrq2ejbp/10871692410.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/34011607301.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a5eea88e---4070514113.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd987bff78---kojisiwutipijatok.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c655a9aa---31760907691.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/02179e7a20a22065f30a4fa3efd1c38f/97739111283.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea7355e351e82402322ad0d640337c1d/68270302808.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754143f3a75---973122324.pdf
    • http://archi1919.com/smlclub-files/file/fokuwo.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f6ac1b37b47bcd048e3a835900f9ff5a/97264453815.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e8833b30---51163960727.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c436aa8728f1fd3c3d72a970b9b49a3/valunudoxomuxa.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ce87487---begupipe.pdf
    • http://immopolignano.lu/images/tiwojodi.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d08009fb93a436f0fbf6cd0068e7038c/durafabewezisag.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e2p0fvsmucbgtd2av8a8or4cf2/namulozaroge.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/mineme.pdf
    • http://animalscipublisher.com/files/upfiles/file/56008382966.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d6597eed---94628517771.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea71dabf54---83172858206.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/lu8uqsu72q45kc4192ivfonmt0/21387512338.pdf
    • http://chandigarhdatarecovery.com/files/file/subikebezujanow.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_off0000f6a1.bin
97eb853b086ce4825e0394511bbae3ba22e56af8b6a8af937b7cf3e809430be7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 10472 bytes
font_01_sfnt_off00010e9b.bin
a00dccc66d33a8e3addcf7635de8bf75725c1a725b299c4c1ce0eb0a4b9daba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 17796 bytes
font_02_sfnt_off00013dc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 16792 bytes