Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8741ad67beb2deb…

MALICIOUS

PDF

93.6 KB Created: 2021-07-01 10:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ae6b13dde9956b3498b3291c8563f51 SHA-1: 9b31d948e2d16b9e5d5cb8ceb3e388c1a1e31769 SHA-256: d8741ad67beb2deb3a2110765afa2706fd87828a2c6b33bdf9238847eb8b48a5
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9760c7c8c---48624747906.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0865ccbbfcad7174cf345c7609494155/31457997251.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ea9245b11a359d9601eae57156a7819c/8005353815.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc3c8f635---zejejelejabotot.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1fdaa6319c4650350f1d5aad7e1ea602/revipimu.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3ee9c515---nogolelujijokejud.pdf
    • http://biurod9.pl/public/userfiles/file/vawopakazitarafawuzez.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/48ce1cb6b42133606bb282508bf25d2c/66983490642.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8e31447549769c486d0ac79bdcd2e0b5/fokusikeboz.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd6450600---63476628406.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/25923632865.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d358533fbff40e3ef0787417bec3807/91791826751.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gevabirafufozut.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3e371607c9573a1a55ef4c5a7461a140/34441563314.pdf
    • http://compufoxmail.com/userfiles/file/93198829552.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeeffa1a98---86972156272.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf405dab5---41968593319.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d853b7e9b---28438247525.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df38821548---80453729871.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b19079f---53963959085.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31cd63082---42870468244.pdf
    • http://lezeckastenakosice.sk/upload/files/futerumizazogupofede.pdf
    • http://uekekb.ru/!upload/files/nunidukojuxapagixadubusud.pdf
    • https://mayurherbal.com/userfiles/file/93272172218.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clean+glass+top+stove+with+baking+soda
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
font_01_sfnt_off000108bf.bin
b76ecc128555dc72316951fe0ecf2a6eff4f873def262d94bf2d467bac95439b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17664 bytes
font_02_sfnt_off00012302.bin
9629142922c36a9935aea4e7bb31c28f4b3a7ff4a4362508c3dce7b75b3256a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10984 bytes
font_03_sfnt_off00013c18.bin
3a272402f184df236e2bfac36c1826e5f05093bffaa4b25ed7c9b00ddc2d3214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 17284 bytes

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