Malicious PDF — malware analysis report

Static analysis result for SHA-256 54591ccdc7aab325…

MALICIOUS

PDF

105.8 KB Created: 2021-07-03 23:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a25d47779f6367f49759b0127f27808c SHA-1: 8c3b8599886dda8315f42c5ed233b9bf7589c920 SHA-256: 54591ccdc7aab3254628a587c681b68b24be52a224b905335d2175ed0d096314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable domains. While no executable scripts were extracted, the presence of multiple suspicious URLs suggests a redirection mechanism to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://lemanssrl.it/file/58200977282.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a79644e98---13711943970.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/zasurumuzuvelusita.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d1d37320c4200d795a574fd6e9fddea9/rusasopumigoxexosibin.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0edd3953fb---serebugewam.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/24462098810.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/94l3adm00h9jidkc8t0no5bij1/kapegigexopadolexuke.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/jumilulubo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/23971218308.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rapoda.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7c7632c9---33118956291.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m1poce4k7upv7fftr2rhafvqul/kokufojan.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4c484e9a---fafivunet.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/amaihf8taiqbi077aupgte5ak0/66284246693.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/57fbiockfnvhco6b4f96i5htga/zaxumabevatevudivag.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4936dd7fca---21311688977.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f3ebacf8292927aa476ddb1095c2f0dd/koxidifivavajulo.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/lemuganal.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/864000068288cf97ece76ec9e46b2642/texotajeda.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117f47a74e---pezebekapexi.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zukewemarimup.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15ff731b2---sazixugu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6c4210e2---tuxigobuxezovawotobedu.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/58154974921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=justice+league+zack+snyder+castPDF 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_off00013a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528D 10784 bytes
SHA-256: 4023bdc7d166b3e7986e80a72b0d636d951bb6c4095aa352f977675b447f9562
font_02_sfnt_off00016b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B66 18024 bytes
SHA-256: 61f5c865122ff0f2ba8233f3c6c804c336497412495d8617baae0be37c279de5