Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a3504c587ef8a…

MALICIOUS

PDF

96.7 KB Created: 2021-06-28 00:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 545ca4b0dd5f729f73cc1c6e7318329e SHA-1: a033339311c9c8e32c87ff399da0b3be5a874188 SHA-256: ab1a3504c587ef8a3c33c30f026619bb5beb0953fcf43e588b2cd3bd8bbd7579
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to download further malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076005b926cd---24709489933.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rq80kmn1r8a5idimo1is8gf5k5/96822830523.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgclbk29grhecaflspf983jif5/sanelogavikediluruji.pdf
    • http://china-zub.ru/userfiles/file/49314129733.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e945f7b2---xuruzunakoruvobafiv.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5890016ccfdfbeaf2bdda79a61388d44/kejuvafanatetazigopa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/86e9634135ecd91e8dc5020595bfdfa8/vizixa.pdf
    • http://boathousebrokerage.com/userfiles/file/25420021753.pdf
    • http://valsadindustries.com/userfiles/file/tozafinirigafov.pdf
    • http://rilta.net/userfiles/files/zifixaponi.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pffq7c3bbre6ai2hbd331vt5j0/gibinuxunewurugawudugamok.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/8811180276.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/kamalopetekekulafozun.pdf
    • http://esipro.fr/userfiles/file/zixibaxexijebofipafa.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080971f0c9de---8688785561.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22ae7ffcd7e775424e06db709414f21e/fomat.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dcca4265d500c2c89f5c69d323806227/45193689621.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb032d0cf---vonawoxovajalaxutonomovop.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca83ede39---nuwudaxaxamafivijinuwowo.pdf
    • http://nage-z.com/ckfinder/userfiles/files/gefofabegikatozoxerigeto.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019de9007f---84969144268.pdf
    • https://its-bulgaria.bg/files/file/9339657834.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088acbe1972b---wopovi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7a654b1e---11471571165.pdf
    • https://questyme.com/userfiles/file/xosovusepaxiwalur.pdf
    • http://abnicum.com/files/file/1326387805.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/53918880755.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bollywood+torrenting+sites
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/26d973bd75e9330466e1d625d044b546/99820407540.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_off000115db.bin
aeef3af89e55d7b4b38c269ed1d94632a6f6df7567d9ca1f3f8d0f61c93de1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 18016 bytes
font_01_sfnt_off000145a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 16792 bytes
font_02_sfnt_off00015db8.bin
14cb1901eeb4782f196536e827a53c219d1ff365884a3f96699c008706e03936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB8 10512 bytes

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