Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea78baf84bf962…

MALICIOUS

PDF

142.6 KB Created: 2021-06-15 20:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14532b9a98770e1a365b864a3d40fab9 SHA-1: de1e117e6ad9f072b09d6b65b9ba99522e39d871 SHA-256: a1ea78baf84bf962c717204f169c602c071ebf7273204f5dc71eb772a69191db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=all+weapons+breath+of+the+wild PDF link annotation
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/98ec713d44db7eed30ae363d9f550acd/29147134406.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/vijavagetasesasim.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d264d60139864abb34443b392bc61b49/51304965053.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f19e65a6---88511962035.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96caee66d---fibivugili.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/mabomekelebonurenuwofol.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a2c12567095e4bcf17906d60c18b0c98/nupesumam.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f2c56c0c1c43475b7063ae171f6e64cf/98575383639.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/59b923ecb0b2310004fe4e0024c1f155/kosizaxigubafaniju.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08fc38fe4---wigilisekuzerukugifev.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/xedebetewinisegikinuxakod.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc3e12f7a---tiviniwopedomi.pdfIn PDF document text
    • https://ikima.fr/uploads/file/votijinoxukenesomabexuzab.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d50fdbb8ca4d8e81a8bacddc7800672e/babapofafukulipegimi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd33cc1c6---48657845003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7BD 18352 bytes
SHA-256: d9b552b3ce2754689a2e60efef689ccd1d85369491893343e43db47aec485a62
font_01_sfnt_off0001f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F319 5352 bytes
SHA-256: 3db1307893572e3a532585e296a6702796bb349d040c7b3ba7803614cf29ee24
font_02_sfnt_off00020550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20550 11888 bytes
SHA-256: 76fe61d6fbda8a72ca78e3bab2d0bab4b4c3ef8e5def330fd8597c572245a545