Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f7bb912b2d7306…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 06:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc875b99ea811795feb3952ed4c86a76 SHA-1: ff79d6a8e0e12db62c48b80986d5902058e04e3c SHA-256: 24f7bb912b2d7306291fcfdcc4b1e406df0446fd39bb5a4d916d72004d49c1a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://flamefitnessstudio.com/cewit/images/file/87061145758.pdf
    • http://castrolmintabolt.hu/images/upload/file/38135189664.pdf
    • https://gastriklandsbf.se/UserFiles/files/2839846132.pdf
    • http://studiosaletta.it/userfiles/files/45351586360.pdf
    • https://coffeetuanvang.com/Images_upload/files/22384289764.pdf
    • https://maffart-guy.com/userfiles/file/worarowozolonufurufufene.pdf
    • https://mimpidia2.com/contents/files/kudurofaxogomaful.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mowulumez.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/plcf4sf6ll9v07rl3v1p3op402/69971271766.pdf
    • http://kinel-hunter.ru/upfiles/file/72435161056.pdf
    • http://asustainable.com/global/file/58182570367.pdf
    • http://otohondamientay.com/upload/files/80947959945.pdf
    • https://transit-connection.com/userfiles/files/94921590554.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b55b1fce8d911004b9988b9b339e2f9/71484847092.pdf
    • http://capitaldanceacademy.com/userfiles/files/99033471040.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71db7ebb5---1709756479.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/528c75a9fdee1851dee5bf6a1ad76209/15620138694.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca56632af---47638495171.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c97954befbc---15112747394.pdf
    • http://jpind.pl/userfiles/file/xugimewadomawip.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799ba41feb5---sonov.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-18/20210618022610865075.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c9ce496d5ee02ec24f71b12622d8f662/subexirigapofelogup.pdf
    • http://sushigonewildtogo.com/uploads/files/tujaniviweritigamuk.pdf
    • https://atphp.ch/userfiles/file/lefan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=speaking+prompts+for+esl+students
    • 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_off0000cc82.bin
ea86187b49cf88cfa4cc6f898500e3a90933ba75b7291b3253e16c9f254d0f7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 17396 bytes
font_01_sfnt_off0000f9db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 16792 bytes
font_02_sfnt_off000111f2.bin
b3af62e86be7f63f8b8d176704dbd71d755da5a71f6d8020980cb7073fddc2d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 11108 bytes