Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc3107aedd5104d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 12:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d79f498ae765e429a5b60bd348be109 SHA-1: 29f3c99a10c870ca92d39f8b3f90f1d87494437d SHA-256: 4bc3107aedd5104d9567826ee2229b3502c9edf2d310c56bdc336f41ce9de093
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of urgency and invoice lures further supports this, indicating the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/64236927792.pdf In PDF document text
    • https://33mobility.net/uploads/files/43138428310.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8a8a81c106452f0b66fec8d176b91626/85314380853.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/64937805084.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iobfm8p6tlhc12dnstoj5f5qv4/24320407033.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/10a65cbfd9ea13c0ee1f630e1a449f02/bemuzizilexobobikajiza.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/woseduxesojani.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-6/20210606034303574342.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4f0b48578---memapozuk.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7752c1247c---siron.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/52614384067.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dde7d05d9d9bc4f76dfd28525e5c50e3/gukunelodisigakifugadeju.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/73357609856.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e831e8534---40285038477.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kojusub.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/40246809848.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/22a26f6a3f1d141730536226fbafe56b/sikimi.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/32779932284.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nujisaxuxumubawafuzunovav.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c587417---41535193449.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3afb065b63acd1592260687defb0f58a/73705640627.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=thermotron+2800+programmer+controller+manualPDF link annotation
    • 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 18600 bytes
SHA-256: 3448c1114da2c62430b228784b43f03489e3d46ae6f2428b2e9a89b7559cdddb
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 11072 bytes
SHA-256: 0dc820bc43fcc0e78c816127ac04b0a97a465fde60bfdae4613a4bfb82834996
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1