Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7949743b09da7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9668336abb4501b8718c339d941ca59e SHA-1: be81244e0a10acb9312e263a4ed210f2853dbccf SHA-256: 5ff7949743b09da7bdff179be5d88d10d8187ba56c2546cb3433acaf8f8c9290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on various websites. The presence of multiple compromised CMS upload links and disposable hosting suggests an attempt to obscure the ultimate destination and evade detection. While no scripts were directly extracted, the heuristic firings indicate a malicious intent to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ukmriptek.org/codeIgniter-hmvc/userfiles/files/bujidogadipalujevowamazo.pdf In PDF document text
    • http://rafaelokazakov.com/file/84661180686.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/978e60533e9ab0d519fbaba3bc7a1579/99092167744.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/dapakewobijuj.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/64769963650.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/kadikesuk.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dotijesibogi.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/fakagivafibizukob.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ab0282d370c9760956aca7169c3d6fc9/89394279105.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c774433b24da998b321e9af44db40eca/60268262137.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/76227988746.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/75816039234.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/66477852188245fd691fdb7e673c91c1/dobal.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/40122431278.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lofuvutonikokobimip.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/puzamut.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/misutulazovejijivukalenel.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/56410102649.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ad79c712---torinorixojideweduxola.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/ronexeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mackie+cfx12+mkii%2Bmanual+en+espa%C3%B1olPDF 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_off0000aea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 14528 bytes
SHA-256: cce172b86a4b513d20d3209fb6d9de7112ca4bca9b2f6d5ec08affc4a7c93c4f
font_02_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 11108 bytes
SHA-256: efb3622c11b9e815fce5a20564e2c458209d78d0331723fc3204353ace3e678b