Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e55868b8d6c44c3…

MALICIOUS

PDF

75.6 KB Created: 2021-06-26 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b08f68660b99a171ff6366db8354082f SHA-1: 3f4c29eb3d54713df713f658da4f3a438b2c3834 SHA-256: 5e55868b8d6c44c3bef6ad004305a2cb5931d16cdac7e621d3e31978c84c0120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs extracted from the document point to compromised WordPress sites and other disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://betenenergy.com/sites/default/files/file/13737046178.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab9555909---fitotudowikomom.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49ee4651c---bukusal.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2bbded43035bdfeef4cef8089e22b277/19810440477.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608256355f426---45108319936.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b32db3c1e---woxafumojov.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vowem.pdfIn PDF document text
    • http://360mart.net/uploads/files/wumedijojuloz.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/064a5c5a9a67f81dd274f0fe8936798e/85712038089.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/mowilenawagedapexepuses.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/31876148308.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/991751387.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/xaseduditejilok.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a755d1f30e611f1b8ec52192561e04ec/33278736663.pdfIn PDF document text
    • https://motacademy.it/file/12470932525.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0659fdb1d3---wifemujijonerorosurora.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6nck4lrl2jgorap114g23sb47d/50804793659.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/31452981335.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/30755arlpfo5o10g119do55qcg/55115175217.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/ninulopurafolato.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o7t08brss6uvpllekdtpc77but/vivufisufege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=one+thing+remains+israel+houghton+chordsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 10944 bytes
SHA-256: c56f26c6631487a6c5810149115fc73dc646daabee90efcc391c6e21525b63d0
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 19228 bytes
SHA-256: f9dc11b3e7d2dddd95d6a9aed1e4f0775b276cba433a02c655a1cae0129f3c09
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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