Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9c25c68349d08c…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 07:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e24e31346894c259ea854e0f8857504 SHA-1: b1e949695a6b2c257d97f22311580c3ed9a084cb SHA-256: ef9c25c68349d08c90bb91f216b648b356cc4ecfa5c2d14f9e79be2eb3ab5eba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=charge+ps4+controller+on+pc
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed68790e6e---duxojapizokagarutebavepe.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0l4bcghmts4a3pgtcono5ch80i/dewaxadokevobojazuwow.pdf
    • http://janandpoos.com/clients/872640/File/kinabok.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/doxixifugofumuwep.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abca78cb44d---kegobifekelufipez.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185c03ec12---mukegokowefedusumevosod.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g2nq5e49c7baak9lurmo0e9t65/82958293812.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ef55afea63df47ae699847b8b4b762f4/vufofunopafuxonodekiniv.pdf
    • http://iworking.vn/uploads/files/lorawe.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7397c200---nanelipikuzuxidubifopu.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/39b4d2a116af45d50df4ed3d2921e6c6/pasamolofiro.pdf
    • https://novahealthclinic.ca/userfiles/file/88778707311.pdf
    • http://anatolianlgs.com/userfiles/file/kiwovelosefu.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071eecce99cf---89777039915.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328d5345d9---xajidimujowi.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa4b8da136---40936704236.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/zuziparesusalutoti.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/eff32q39bfdt5drth05rua9lg5/sinewumuki.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf747cba4---gabanupeposerukopirano.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/096e5b52ff026c1f7db21ccbcd136f7a/45954654765.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098be5493b20---jorofisimibamowexunupa.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759571f0bb3---liwexu.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/11618032456.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_off0000f802.bin
6b922a29ad80ce5756463fc436ac24c5753992290a2539dd47e7b3c68fc02e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10672 bytes
font_01_sfnt_off0001107d.bin
46b5ad03dbdcbedba1a359f1cf183fa324b2bd39f981e4017223ebf54938b7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 17372 bytes
font_02_sfnt_off00013dfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 16792 bytes

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