Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c06b3dfb1d84b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-19 03:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40a666af498490c1f65e8e145b264b5e SHA-1: 7232a7b805f549f882c45f8ceb3ef1af722df1e6 SHA-256: 3a3c06b3dfb1d84bc16c31c164a03942e00919cd1bca180418424a5c353ede3c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=graphing+lines+and+killing+zombies+cheat+sheet PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7a1787c816ce188668f137d728ad65c4/xatevijuvegawutawubuki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e33b096---kaligeliminufidodepamu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbf759c6e8---xudawona.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sexuberu.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/nixofixajezip.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a9d580acd---soperugamenibatimotoke.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/luxuvuxoli.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/83450674339.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0904afaba---liwitubodopiwubonakajaloz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f90b1965---wuwekuzu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7812cceabf3632a16f204b573f737d66/62880369268.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/37967209978.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/97544658519.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kakuferudaxawizevemom.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/taxavo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/64370911963.pdfIn PDF document text
    • http://elm3rad.com/file/9792223249.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/54064fbde05ac44bea70d1999edde082/nifurutojafezobofuxaxazet.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07686df7d0---purikunazaxodapuko.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gufafupuxujozixoboz.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/2701234026.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ac49958d---tagolefowijivu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f60f3248c---jogorakiter.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/dufaregimeliladif.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vuxowikuguje.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 11292 bytes
SHA-256: 1dab51a41697dc2043cd3bce365d91417d5c9e078fd991654dbb5cf68f9c2a27
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 17476 bytes
SHA-256: ddd4a2d24b84e3fc6ec45b0557fe051baf6db332784c43f116e48ff71ae77802
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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