Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab1d1d8a8a8b2a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 12:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5a6d7397b435cc6a490fb4df6ac1340 SHA-1: 6f63dcf33b5f281dcc63a6c8036d155a90b27e6e SHA-256: c4ab1d1d8a8a8b2a5ad606a164a47270c7b7f463a3b10ca0d036b2362b931e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=cloud+games+free PDF link annotation
    • http://auroraenergyproject.it/userfiles/files/65985435796.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zapugodejapava.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/17615376821.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c571114e8---xajara.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140452e979d5---23964600220.pdfIn PDF document text
    • http://indemo.pl/Image/files/mefepagu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vakuwemaz.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/16444042171.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/67608267129.pdfIn PDF document text
    • http://fitviewer.de/files/file/72776767380.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zapofuzegusetukisuviviga.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161484baeaf429---samulijinisurozasokevojal.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/taxilakel.pdfIn PDF document text
    • http://praguetransfer.com/files/file/25107529438.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/72047942407.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/11761694907.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/guwupurefifibu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/832e0f473270fd156f972c9b311da1f9/renebebaduroxulofub.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c8def02c---41195368512.pdfIn PDF document text
    • http://ekouklid.eu/UserFiles/file/63097013868.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614090509ddd6---28484690292.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/foxugavulajazupi.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/17976356062.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 17904 bytes
SHA-256: 7fb834f8a03c6a62fe196b9e538335a8c1b21a6d9ac0318777b8436b179501ec
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 10536 bytes
SHA-256: acaec2ffaab4eecd67a2cb3fc7cb663cbbe7d761c29a1b6e0799215ebd92a2fa

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