Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4e9f13e8ba7f6…

MALICIOUS

PDF

91.4 KB Created: 2021-08-03 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca108930862db3e6a048188662d9e171 SHA-1: 4d2c78d127d5efa451e9a4b287a583282e424818 SHA-256: 8ff4e9f13e8ba7f6ac9a8b13c6ddfc2a21b08d89610149eb9bca7f2025dd84ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm hosted on compromised WordPress sites, likely serving as a lure for phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious destinations, aligning with a phishing or content-luring attack pattern.

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba6a28047---19401348696.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4h7ecu678d6eq1k5se573qud6i/57543103733.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/67327683998.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/70c570d58f8c889de2a3716e23547279/86797359866.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a0bce90f59b5cdb54fdbc34e49f047d4/gafepubafozukirakoxalav.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/4744480487.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gekumod.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec49bb5920---30508776058.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/vasegatakuneselisi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jijeridunogu.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/73721976448.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/xulufafadefavo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1e2f0d8e2ae5baed32d79ee2c9eb9984/nugopimof.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/jevagobapewupuk.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29987067455.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/2284df2e4cc87cb404026e2983e462d8/riwugitajinakixejuwinufa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d86bcb3a---lakuwopililexawelanimodu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db55aeeddb9---65650202808.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9980462---buvugofijuwab.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/73ed62fa0204f0eac36cbefa440494a4/34812354208.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a40fc739d3fb10aab1ac4609bccfc570/fugulo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40194158541.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ca8ab6ee---10103539545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+change+your+mindset+to+positive+pdfPDF 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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 11380 bytes
SHA-256: 2cd1d9818e67fb556ec52d6effe895a7bb9544410f3222e51d1faa87bdeb3bb5
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16728 bytes
SHA-256: 0cdad35c3a3530f765f288fa06990a5d7cdb4c66544857f2a228dc104f04bbd7

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