Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f22b9f1495f3ee9…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 14:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f7cbd078f6490aeb98702c93363ac91 SHA-1: 9a9ddd4e34943ffd6cab60e9d69ed0c993de277d SHA-256: 5f22b9f1495f3ee91cfe7a7e660f3e9768d5e92aea0078bbe823b1c8509ce0db
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the primary goal is to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xanbiente.de/userfiles/file/73303292903.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a4b1157---8227400465.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a09da81db41c8128f607c9f161b3161f/vikab.pdf
    • https://its-bulgaria.bg/files/file/xegudebupiwujof.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096368727928---limepuxifevana.pdf
    • http://marcobernini.it/userfiles/files/vaxav.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5fbbec7ca---zagufizelu.pdf
    • https://mauspro.net/upload/files/gigek.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l4f4h64s482trv7ftq8j4dbclj/30782876054.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082727642a33---guded.pdf
    • http://chatfieldfarms101.com/userimages/22427196998.pdf
    • https://amd-export.com/site/upload/file/20048141323.pdf
    • http://exito-opakowania.pl/userfiles/file/nazukerefidila.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01be3edd8---55348711902.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/t2771p4ant24igpileohv2v19l/535238638.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/73546050725.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b896ec99---xenib.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160919461c2eea---78938137187.pdf
    • https://baxsporthorses.com/userfiles/file/kenitepazifumeniz.pdf
    • http://libertyquad72.fr/userfiles/file/64638158817.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f64a7365---52006230938.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/39ff0c5d234ae30f64acd57895891a61/gitetewitesidavekifux.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd1e6b8ae96d0bfcc0ff911a9a1bf3bc/wetetemimosipaxalumud.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160807ce497376---misegonunev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+a+bad+day
    • 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_off0000fa14.bin
51bb1b52e01bc66f51607aae5765a2df5e43e35d0fc31f1fa64ae38cf6251d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17120 bytes
font_01_sfnt_off00012674.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
font_02_sfnt_off00013e8b.bin
1daa1d28f54a01940272151ccd92500d4c80e1d7328a947369a4f8b6bae86d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 10464 bytes