Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa8b104737523af…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 16:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23285854c5da04e173418167280d86a9 SHA-1: b38b1cacf0b036865c02c59796c9c6f29da56021 SHA-256: 0fa8b104737523af28cd20737541f515c76808b4292911e8917ae3d6c929ce1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of numerous URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=hukum+archimedes+pdf PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f462ba82---21492346827.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nemes.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/10159338484.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a858956f3b1---68195825523.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c970d5036f1---lavixosatowejisepa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4bd62c0886543e5c5e317c7ca65c853a/fararudenoregesabukugomon.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/selobev.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55de9f9b1c28b32057cb596c135952fe/92503761460.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea416e441---bugerinazexewenu.pdfIn PDF document text
    • https://actorconseil.com/files/file/kowafotewoba.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/915eaf9d55de1c39bd6d931b9387a9e6/9950881419.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210830215627579596nosxgp43rylt.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qs33cq4chvn50n4n94lmhgn1d7/7667870510.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/73056502205.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/14702158058.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0fca55bbcb955d0b1afbbcdc1df4b5a7/vuforowaw.pdfIn PDF document text
    • https://geniodelweb.com/file/38844967623.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/38362207724.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/jebuv.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ddf36e31---50381506307.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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 18076 bytes
SHA-256: ffc048e4229aab821be87e73011dc2676fbd47ecb99e5ffd7793eea2f7eb0b3b
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10700 bytes
SHA-256: 61dd5d00126e7fc142e0f256efee6db2363187375a1590ba02dcdc6aa584c570
font_02_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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