Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cd837b79189611…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 03:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb3980dafd27b5c080c78cd9aa0b4632 SHA-1: 95ef516ce75eced27e3638c5dcd3ff999ce19754 SHA-256: 41cd837b79189611e09d2d7c355a5d9cbc141a8c278b81653c4c074d82f1ab26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using compromised or disposable hosting for malicious links. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=induction+motor+project+pdf PDF link annotation
    • http://namngonviet.vn/user-/files/lenixa.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/vodupovawenokiru.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fufosexusugawojumavot.pdfIn PDF document text
    • http://atomleasing.ru/media/File/37025128997.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609497feb869f---rinomebawo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74356a26ac---xemekixuwesataxozoj.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/24958884018.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160906359d2c32---julenagazur.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/90716114169.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/13503742167.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4f6fe2f56---3340466496.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4a0ce8b28---41778677394.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ojt2b35jgcp2d5vbkri53b5ln0/rofekawaxilemujujut.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/sunufosajamokoliri.pdfIn PDF document text
    • http://alltechsro.cz/files/92194239332.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lanovisimiketefagovapu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081192bba4ee---36747183050.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc264056c98---56789439365.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/28872838098.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef68ac1a5---xizapaxej.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/xuwazezuwegasuvapatod.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109010138427093.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_off0000b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 10588 bytes
SHA-256: 12a80bf9e7469523735160e0b977fae6a365414fb833ca3046c61946fc1ee98e
font_02_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 16572 bytes
SHA-256: 18db30901ced11e2ac3843f121ee57f521a414319b5598c0a8f3f427d7b2bdf9

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