Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d481b94cc4fbb6…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 00:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7383f91bcb19fa565734df5a2751b247 SHA-1: 427c15c6c2cd82238fe75ca56fed1449dccc603f SHA-256: 51d481b94cc4fbb690a40d7485a6f6740744747a5a2bfb061c7903084afc1e71
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised WordPress uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and IP address literals further supports this, likely serving as lures to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=synchronization+of+generators+with+grid+pdf PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f89e0912---62990496286.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/51599739046.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f6l5mvi1u14l1msdi6b38rilcn/55264367875.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/rugitububuvevepop.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/zasekogivubutuw.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/39342800480.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6818df882a8129236cd2d468f863cc38/94459799636.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1eb2c997---majemijerafavenag.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080945b2931e---bamopamizunawarurugisine.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/63990764713.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ac2da5s0u7q1a46p2kilab9841/90749596753.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/23396521913.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1cd618b4c988c545d9fc5549000a84c9/baravudibokaxib.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acffe59817---lewatameze.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/q57rebukf0m2hdfg7lkd70lhcg/tawuzez.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/60762482205.pdfPDF link annotation
    • https://strategieb2b.com/userfiles/file/20295822828.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/30184884654.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/18691171425.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609f079af1162---74218513119.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2612792e---nubizorasalubutimena.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/sujatino.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/85770e91616b4d813a88a285b7783a84/sagosefi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c322cdb13b0---71517620634.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wurikuvabiwapovud.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d4415c27d---48994624497.pdfIn PDF document text
    • http://premo.at/userfiles/file/zolovivatudirisuxonupi.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11188 bytes
SHA-256: 164166f5a452eb8fa5469763f31f3bf2ca181572237bd96dcef824ea59e650f3
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 18224 bytes
SHA-256: 7eb1e2ecae224b7015a4010c9fcc9f60cdd8bfda529877c94a9cb9d4f5138e1d

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