Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c296af5fc2384…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 06:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c77185ffc99cbb07f57b3e640c807334 SHA-1: 5f0526ec51ef09fe24ce2d58fc2a0d29304b5cc6 SHA-256: 925c296af5fc2384815ba7663959ff7edde2e04d94f09b5853b2dfa7975cfbf3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=kdcc+bank+exam+previous+papers
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160806a7e68245---mudigavokoguloxugeda.pdf
    • http://novussiteyonetimi.com/uploads/file/nikoredufodazaxufaxi.pdf
    • http://asiancfea.org/userfiles/file/zusixelogigiselulu.pdf
    • http://technocom.pl/editor/file/botoka.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fde6c17be---254365631.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0bd51093---vemujelo.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/td1fp55vgerisq39mop9ip9511/80704657570.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c84ac6ddabd8585c15a3e9b75bbf0676/fovapufumi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9fe73cfe3---86006368596.pdf
    • http://duepassidalcentro.it/userfiles/files/nebokawusedodujegipubutab.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f0450344c490604c7d51796d6f5d5270/javufega.pdf
    • http://www.findvoters.com/userfiles/file/tumetusigikidumozagiv.pdf
    • http://renovator.cz/files/file/ninopofube.pdf
    • https://agrilaui.com/userfiles/file/jidijoxewasarasitixosaxan.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bec53d24b---jorikawibitizugilere.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6bf1ce61bed63d60da242de4cfe65d65/gabekunarawudixaliji.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc62c887db---34426493488.pdf
    • http://bandenplaats.nl/cmsimages/file/68447297718.pdf
    • http://mikailang.net/userfiles/file/20210501110253_2124149476.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a529493f7d5---81826505271.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/zijedejewuxowalupegaf.pdf
    • http://vstarmp.cn/upload/files/20210707_060518.pdf
    • http://studiomarazzi.eu/userfiles/files/fabudiralaru.pdf
    • http://studiogiamberardino.it/userfiles/files/dukeremunajujo.pdf
    • http://pressvaluation.net/userfiles/file/pumedowojuvebumuwuxarevog.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_off0000e673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
font_01_sfnt_off0000fe85.bin
4f49af12b9567e183a65b314028bf9f9d0000b1576c3f3c1c0b04ce0e3ca4343
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 17492 bytes
font_02_sfnt_off00012c7b.bin
549edf976e1ec011640c3147a00d14b1c44a150fe85df5820c4b756a2b50eccb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 11020 bytes