Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b24b29d72ae53d…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa05dbb64cc286ded56cfc1ea60fa482 SHA-1: 545deb63bd5dd60abed967093c32baa178055719 SHA-256: 41b24b29d72ae53d23d02612d300faedbe27464e923cd03149b27ea309a117b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, 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, indicating a tactic of using compromised or disposable hosting for malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=four+letter+p+words PDF link annotation
    • https://funbugs.ie/files/file/54894948101.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/16192158088.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ba0e101---13217542233.pdfIn PDF document text
    • https://pokereshop.cz/data/file/natiwaxelamukati.pdfIn PDF document text
    • http://videocycling.info/files/file/naramozelawofebo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021092300215023.pdfIn PDF document text
    • https://limsurdua.com/contents/files/67535492843.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8526dafb---sebitunaliwepase.pdfIn PDF document text
    • http://zenhowell.com/upload/file/58774545237.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/wolodewiweb.pdfIn PDF document text
    • https://windscrm.net/files/file/54689676438.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/mujujizewa.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rodinomawaminevuwokugefez.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kemame.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e06c14e0---78926743959.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/96305589885.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161523e894624a---najojawepolota.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/55426898230.pdfIn PDF document text
    • https://andrejc.si/files/file/ponazupeliwowavawupuwesi.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632504460.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e7faf1d2a---lirawokadegaxenojiko.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/89955964122.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bd3c36ef3ccf36e42a0a7f18e55ee4/45310511730.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/57327771030.pdfIn PDF document text
    • http://seritour.com/rsm/files/51080146601.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10188 bytes
SHA-256: b522e74a8d8b9194ab5bc08381ea2180030cf5a51f9206a21ee63e038827d63b
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 16092 bytes
SHA-256: 33e2f854bc869ae37f037bbd38611260737cea7c40c76decd96190538e148ec2

Open this report in the interactive analyzer, or submit your own file for analysis.