Malicious PDF — malware analysis report

Static analysis result for SHA-256 59277c745a1eab02…

MALICIOUS

PDF

71.8 KB Created: 2021-06-08 08:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d118d19911dc13442b2fcf7f4f0eae39 SHA-1: ad032962872d306b1cdfe7bd3caf08947b96ab5a SHA-256: 59277c745a1eab02347ad83361e710c7752dc016658e342d0d955b256b7e0c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and appears to contain junk data, but the presence of external links indicates an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=beyblade+burst+god+episode+51+eng+sub PDF link annotation
    • https://pensiuneavalentina.ro/app/webroot/file/79466201639.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97a27bbc9---49042284680.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/50590465151.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/d85vtrvvrr0hd8ske8p4uhglr9/puzefaligisipesik.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a94c7d0f---43035514327.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eir0sd35p2845699909bej1dkg/74591202877.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/93128509763.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c007bb32---gusukexejepenuwof.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608632b7d4737---dovopepalozidoluseguwevud.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f6147fc---13052830552.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516044218.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26185256a9---xuvetopilerowixofatubixo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160771bc30e36e---52951501910.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc0618855---88510656910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 3972 bytes
SHA-256: 05a69ed9de6e6a55e73ad46d904f22e48dde93d528070d5f33cc27944df8236e
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 5592 bytes
SHA-256: 1c1d83faa87ff56749c69de66c4c93ef7bca7b414988ca479920d82fd13e1bb0
font_02_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10492 bytes
SHA-256: b5820bc1a7fb6c7a88f6c807b63fb8b28538e4ccaebfeb445b3d62979349a99a