Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffd1e5271a2d7d8…

MALICIOUS

PDF

92.6 KB Created: 2021-08-02 17:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0eb42797b145778919f5508a7bc5fa1f SHA-1: a6fd9670d6179767ac6d5b731bff10eae1fb8ec3 SHA-256: 4ffd1e5271a2d7d8f7513217a3d02ea69f6c08b26fd4180f21e78f82593637e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The PDF itself appears to be a lure, with the primary malicious activity likely occurring via the external URLs it references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a11ab6ca---xugitobozuvoxisuluj.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nobulupinisududibanabipob.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/regebegidejuzawiwej.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/98598578493.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/78e9fdc05cba2a47be2024ed8b2b399c/jatejerisugujan.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fad60785932---nubudidarujufojezod.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/58055942878.pdfIn PDF document text
    • http://landia-print.com/pdir/file/zezuwufanulasorezutalefu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2e446b31---lokato.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/niwilolevuvuba.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/28313958587.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/75580786601.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/tenodegirulokofox.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/savavazema.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e0341721884fa5ac4dbad583d3f09af3/41187494291.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9edabacea8a8442b821132b4b107029f/gemadumimawuvimizali.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9394e79b2---lugatisowizeno.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/tokoxukezigolaruxalo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kovkvp4u7is08cdph903n4fakf/nejama.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/93958818383.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vnn796mvqvoh3t3cdrqk7njli3/piwuvawukisuta.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608544a635822---suvilurobajivurubanupobi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e2e7bb09---52446257925.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/87eus3f2iide7rbmbhpt038rmt/gazejolalopifaneza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+experimental+neurosisPDF 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_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 17896 bytes
SHA-256: d1f2621dcfcd087f57d244c326d76071eb20fc0ed6caaf16ec1aaeeca96e9b80
font_02_sfnt_off00014bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCB 10712 bytes
SHA-256: b9b14f18028dc644fb9b576bc2b60610909db98f8cb7845ead71a6622ad66433

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