Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6895e3883f0935…

MALICIOUS

PDF

87.9 KB Created: 2021-05-27 21:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c82bd27a58137b33082a794d617893 SHA-1: 6ccb070cf9f866c25e7acd619c5fc846bc051436 SHA-256: aa6895e3883f093592c60acb01f549c13456b4c2f6863458d663b6c7a58cce3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It utilizes a link farm hosted on compromised WordPress sites, directing users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c00c0181c---monolomimasowod.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bba45a570---sijufodivoxolusutubuke.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b47584d93---22305080149.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ee38752daea416f66fc546be2b3c4b67/kuvegotajifop.pdf
    • https://protradingindia.net/userfiles/file/posoreme.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sepn8gq1m29cb8dus7r11kt864/juxebuwegolapafatuf.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/959679b1058ba61ef2faa6080552d0bd/radik.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe3dbbcfb---30628137434.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608360b5eb41f---fefiwi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7d20d96e---2090244231.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3626b6dc5---xobebisapu.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1146bfff---6822382423.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc071d48b1---vonofomipolumirejipobuzi.pdf
    • http://mulroyenvironmental.ie/userfiles/file/21467808307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=general+knowledge+mcq+questions+and+answers+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b4.bin
9ac294f3364b95d48db8e2d770dc1018bcc1656fb43d214b069110cbc8e5c4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 5788 bytes
font_01_sfnt_off00012b65.bin
242bc99a64f1156b14bf20bd9aeea7551d6bf07aca1eaefe68d283d25a214d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 10936 bytes

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