Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b7284bf7c79b07…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 15:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 024bbbef07d2832b66baf28ec6751220 SHA-1: 009f0ddffed120e661929b081fa6029e65d457ea SHA-256: 84b7284bf7c79b0724bfaa015a5dcce94dbf7e6a4a6e3fafca21f6fecde39cab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eltonltd.ru/sites/default/files/uploads/maburuvosexogepa.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f985a6b842e---26894007797.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/53151963779.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b71362fc---31324901354.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/judijanipoxufasasuru.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/suwuvifuzewezazote.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5de80a2b9d---varijupit.pdfIn PDF document text
    • http://fourfoods.com/images/files/dugilibajopulukunegilagiw.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jasovamisuxugol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161215d94e90bf---31130855671.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/86289494667.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/81hguj36hi1vjn72db031nogbp/pexokitud.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/pazejibiguxonuge.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160963c6c6925c---naregula.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d3bbf1593391e82e86a2dde840ff9b9e/tovejimoxoruvodunobujak.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/72646672817.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d65d6f8cd---jubamisejakurotejimitan.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/35949206954.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/nuritadodinavuf.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/kigegevupowepamuku.pdfIn PDF document text
    • http://119pump.net/d/files/42286369353.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bu25m750o63sjld6dj6t8kdu44/wegajivuxinarosilotura.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/70063857864.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79f96a886---35839920213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=up+police+constable+pdf+bookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23C 10752 bytes
SHA-256: f88ecfe6832e55093f1352dabc1ccb8f16cc28ea9cbf638848c0d3fdd0afbdfd
font_01_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 16064 bytes
SHA-256: 47ce03d66f96a8aa320ef28b15a1ae076bf63662440f979cdce8121283056a3b
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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