Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf3bae78d9cf83d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 06:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de3acfd23b6efea7cc632121d1397424 SHA-1: 4a06609be3822fafda65d7ea3363a41daaab689d SHA-256: 4cf3bae78d9cf83d1ca66bfe58786d37643ae9249028fa7f0336c1e5300e3b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3090183d---7052260172.pdf
    • http://leaguengn.com/userfiles/file///91842974003.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b6efngslnkrob9trgo6m8uq3jn/lexoxowisabosalet.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2057562d46---peluruxuvewetedefodemo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d914b8d5781---mexemad.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160970095234cf---8153681831.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210704_A76571D4FD958103.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed2fc5d66---subupovajom.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/tsl2ogom4jvb1b604kdkq92urq/xikumafivuj.pdf
    • http://marthomaiticherukole.com/userfiles/file/terabiwiz.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/612dc114c39849b6f45fd743ed595cec/79158767756.pdf
    • https://adtw1.com/ckfinder/userfiles/files/rixosarivitiruwasuk.pdf
    • http://jar-ted.pl/file/80826233764.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//59454327567.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/47js37jooars7vkbkis4498d4v/jureme.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fefubuvuvedilose.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c541578ae39---70814289662.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608163b05dad8---81894451166.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ed54aa5b---31236014170.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/nisipudejawa.pdf
    • http://ahkjt.com/upfile/file/62420572097.pdf
    • http://bensonlandscape.com/editorData/file/jexowakanidejujezokixulem.pdf
    • http://studioscoponi.eu/userfiles/files/resosiximise.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/gamivomeraluzomupa.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a1af9c877055672624d350514e5966c7/1094505858.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=calories+in+a+sleeve+of+saltine+crackers
    • 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_off0000edb5.bin
8e372893f6dbe7778411f3a668a8ad466decbc5c61519f12fd3ab46f0e512207
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 17924 bytes
font_01_sfnt_off00011cda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 16792 bytes
font_02_sfnt_off000134f1.bin
661a3ec982677f171b46b15e69f12ccb3f0a22500a45f31d558485142c237087
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 10520 bytes