Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5878d45709c529f…

MALICIOUS

PDF

104.5 KB Created: 2021-07-20 09:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0a9497d9caab28d8de17cbb805f3dc3 SHA-1: a7ade8822f39b0d49cfe2c2fb50ffcd9d9de1d86 SHA-256: d5878d45709c529f7803d4f1c556a882c34a5c12953171def0719ac73c10a43f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bensonlandscape.com/editorData/file/20908360366.pdf In PDF document text
    • http://slesnick.net/userfiles/files/soxegewixisudif.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbcc7b058---72151591768.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097728441d3f---87597652296.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070a23131f99---43798175590.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/bf1b2fe78f1a02978ad6d5d488d7ed35/60181582655.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebcdc26ed---mujulavufubulepodelu.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/sesojemovotunujomiza.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/92895564053.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/23507984917.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963df9b9f3---41898296792.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/didubasolotogoritixito.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/folivegaxitoropitapesoxo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7b8e0d25f1805475690c8288820a0b36/lajesazekem.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/8624028409.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6fd138f3---gavusonaje.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b6cfeded8---45898982956.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/94188799384.pdfIn PDF document text
    • http://polletnv.be/uploads/files/36419156690.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/pubutedakawaxusiworabo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k2nnj54s6s5559e37o155r7f1v/winorarelopuv.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050923302438259.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/230455562590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=laura+colby+ingallsPDF 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_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 10484 bytes
SHA-256: 182707042cfab859e48deaa23202418c5cb9f49139ecda33bc2354c4076f80a3
font_01_sfnt_off00014cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C8 18448 bytes
SHA-256: 94004dc2a1ecbb8e1503ddd5ef713b74a58ad80d4e9413923475a64a41d265ae

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