Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3da11967d400333…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 18:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f12106ea8238d13806b8b91a15bc88b SHA-1: e28079f9f01d26e8310aabd9723f1d239fb468be SHA-256: e3da11967d4003337c2d819a98f1c01182fd9b6c4068d68fd4f9d3c0582fd16c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The presence of link farm patterns and disposable hosting further supports its role as a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=unladylike+book+pdf PDF link annotation
    • http://interel-rus.ru/test/sites/default/files/file/wipelod.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/fijibebil.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1a3eb2baf1486959c08b376b8750b7d7/bewelegifu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938863b5f4---wapukufuz.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/lejalideratupu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17141b8e85---ripojag.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1bdrds6ccjklj5a2p13v5m8kjq/50168612230.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/043ac558c99b241553417ecc47bc5b23/46869602351.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c170c2de3---51537373733.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/xomizinetuguxoseligavikek.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c3b29d91ea3f1dd62105d2658e44d4e/buborevatawigijonorinerir.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b627af3ae92---55451524711.pdfIn PDF document text
    • https://ebooksweb.net/files/file/24246560957.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea639db87f---getiwakuboze.pdfIn PDF document text
    • https://bem-sa.com/img/file/fevulemorapeloweve.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6b9869860adeb4acaf13be6d385a921a/66525352850.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/26232120283.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/40323732572.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/jorufanuxebepexevatefo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/zefabetofofonajovegaru.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f677c15cb---14781403024.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/saramewibokimutifovazidis.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/38ro7bb6inl1qjr4dm9a3fs5mi/36792328880.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/bunakasadewirozox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 10476 bytes
SHA-256: af74aff3917f1f48f9343ab4fbcf800cacff0adcbd2acd78fce39ed2fcd06d1b
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 18936 bytes
SHA-256: 26e1d2bdc3d6437d3e1146d27c4d1574c23ff8268bde0a07feec13ca2816fda8
font_02_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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