Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0321671d1620bbf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 11:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd0ca4e56ade076e532266df87147e36 SHA-1: 55fd47e294b12f044068e32b5348568a318c3f51 SHA-256: d0321671d1620bbf048173dcb5a192080c75c78b55cf6099a065b38b675f4800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=massey+ferguson+175+service+manual PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8d69973053f3046cd8c618965bddb914/kasorutotag.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/43108781571.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vojipuneriri.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/79596214330.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/6771487371.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/xibovotolu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c0c57932---43948130325.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae69022eef54cae0d1fb990d0fa7d36d/senotodudanomajojojan.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kezevumovisalupiwataj.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zekumed.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/mixotowix.pdfIn PDF document text
    • https://actorconseil.com/files/file/pipaxobes.pdfIn PDF document text
    • http://industra.sk/userfiles/file/ruxusifofodelasojefetoxor.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e025b804d---wenowugijosa.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/32380176002.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb24f2d7b0---kuxuwetaxumegegigoguwawa.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/jafefeduwudemabuxusam.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3aad78872e37c83eb5e4ddd9c9ea8f4d/91857351493.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/28667128352.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0d2fb73bb0d8c26ffc6fd8fd115ab34e/13252424706.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/65701887052.pdfIn PDF document text
    • http://abnicum.com/files/file/8773214899.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/kelurogedegazuwugaxawog.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jigafijinepejalodazasam.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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 11088 bytes
SHA-256: 079d4ea3bc0744e6e20121e8e5849235bac3ce5f0c1ad16eef9d154ed524ffbb
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 18292 bytes
SHA-256: 29a3a2b0ad37fa72efb367808425b4a09eb27fbe9d5a21c4fe882991c7933a8d
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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