Malicious PDF — malware analysis report

Static analysis result for SHA-256 e791fd95e459cf5c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 03:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7350fff46d7b74bb6c41b172818aeb4 SHA-1: e74bdae5fc12c76f42be87af12b54ec82bd98ea0 SHA-256: e791fd95e459cf5c740165ac826e27d04f06d7fe79e32863c96b653798fa0abb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice or payment language' further supports a phishing or scamming intent. No scripts were extracted, but the overall structure and URL patterns indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=kkmoon+h+264+dvr+manual PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571f3c11e---vabepixojuxitizukifimusu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/tebofabomogusolozifeli.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vatatudosupegep.pdfIn PDF document text
    • https://sharenkon.com/files/nakulazovikugijonawora.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58473b22e---wonikalorepoxajuvivaza.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3095c39ad8---bepuguwezew.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/vogomokexemikinep.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/20377786169.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/516aa15f04005d68749917fad8d8dfc4/karevudilewezijotimul.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/wemosibibobama.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mvg8sev90cq6955k91dej8b4a2/pipegurapiforavoked.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/nlkhr9sehh0t20d313mij9iusv/28378094542.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161076137ebc65---nidalus.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce0f356fa---50746710280.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78f30809---67168435056.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/jusakijowisilulijokijeso.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32d8ae810d---wimuvomuzosiwoxe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d82f6ce11---ferubumelebonosabejavoxim.pdfIn PDF document text
    • http://immopolignano.lu/images/6920950501.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/54106655142.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90d7c3083---keguvuwevolu.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/botidumowevuwosezoremaf.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161316835a0bef---35456750242.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871482e2a8c---5752748364.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/25500488204.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2790fe9270---46371959697.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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 18132 bytes
SHA-256: 0214a97b355750a8d5c911adf93520972c30b7cc66dd30765d7df063a3f4d747
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 10636 bytes
SHA-256: aebf81cf4fa9d60932ff2dbda11cdd9e1cc6ef351992c2e5a0429c097ce794f7

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