Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3ef9295d3b48fa…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 21:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d216e52e11532cb28e8ca5f0fd30f4df SHA-1: 22a008896bdf30c468337628b857004c7951cc12 SHA-256: 3a3ef9295d3b48faee9c333ed4568d7badd60c11008018f97175bb26f60f7cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous external URIs, suggesting it's designed to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=pdf+%2Ffilter%2Fflatedecode+stream PDF link annotation
    • https://duel.pl/userfiles/file/jikubamomokakamo.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/sofanimokoponururebejufa.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2e4050979ebda51f34e5a44103f16f0e/8575470290.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/60755722781.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/92214818247.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/87526983377.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904111636.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/tifaguforevegotejegin.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/53020215462.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/rinigawopibunugap.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/ramakokexigux.pdfIn PDF document text
    • https://mahae.hu/files/files/mepaxinabetejabojilu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/49067790372.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/ginapibumabasul.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/dakawakimiwo.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zepaverupago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136460a60d26---35377425624.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/75706134730.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pujinija.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bugojarozete.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613576449ee62---23233385374.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/71619546349.pdfIn PDF document text
    • http://cpviettin.com/upload/files/54130346467.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lawawejodesawufoxajulavi.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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 16476 bytes
SHA-256: de213f3b464a7d0c8709ad1ef7135432198df664b6c820694c9b9a09d0e12c0a
font_01_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10568 bytes
SHA-256: ec888bb6c0fe60be10d24a28be6864e8001520c92453e7e3acc8f97fb849e1ab

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