Malicious PDF — malware analysis report

Static analysis result for SHA-256 356d7441323a950c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 16:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2b441db342bd00a93565155b637dd3a SHA-1: 7aaf7c2bcdd17643cbe2bc7431c34d36bdaf19e8 SHA-256: 356d7441323a950ceac1f14abfa00a5469c5ff0359e4cd22b355dab6885bdaf4
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to exploit users by directing them to potentially harmful sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=the+bible+knowledge+commentary+free+pdf PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a784258f4c3d89df505dce0a4d228552/bibozo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/zuvamigipubesubakobasax.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c0824f247---kugelulezunitukak.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/ledabemuxewotefufubewaj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a842442ad---79283004946.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c655a9aa---31760907691.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bevajanigazigo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3e114de0ca950720fcccdd0e22c0e6fc/zexinikakixaloruzut.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8a7baff7---balojifimodon.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bc6519aa---kezonitepoketeboji.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/negakuxudak.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3547ab050f---jegutebogonivipodujuxif.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a63546fd---togelamimutelapomo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce84a974e8---88109370392.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848bef47793---63626167717.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c5257b0f50f5200e556521f9f4515372/67356858786.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4b051323---katixiwuferelapuxekepokog.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/romemurufesidizigef.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f53bd3eb---28988655431.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1f893f6bb7d5dec69c3203857d512e2f/45266961135.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/gufuwoganib.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mtfgk5gfphuvc10lt50bq08iph/sabotanolivekezizoji.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e3fb9fea---56802324362.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/womoxulanaluwif.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 20092 bytes
SHA-256: cbd7142b1adcf4afdadaf0d6cc03a72ea33bdfcbdf3598e3f796e70fd3d8a7ca
font_02_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 11296 bytes
SHA-256: fd43f1a128d374088f0e24628a43cffbbba58f4fea823f9b756647ffb2615570

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