Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5085e233d3849ac…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 04:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec3e173bca0d859d9b7c3551daf049c SHA-1: 7409ee83104848ed24e1bef7bf1e64b9dc91dea2 SHA-256: a5085e233d3849ac5ceed1491dbfa91ec45db8947c567b5e280a6b682de8c6ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jirehenl.com/userfiles/file/261753056526.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/vosukun.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/25734480390.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sutuwuzexer.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dda29b835---sasir.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff42ccb43---41117548187.pdfIn PDF document text
    • https://actor-conseil.com/files/file/49983930929.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/delapujerajipo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tilobopulowafetasevana.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf69c19c38---jixewenizulepok.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/bepilegoderovizote.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda3e705f14---76282877027.pdfIn PDF document text
    • https://ccskin.com/geektic/files/milejuwufonesisaduvamij.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96413f1f9---tesev.pdfIn PDF document text
    • https://advik.net/userfiles/file/xisipalitigeja.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l303tmfcshmbfnu0735i9o2017/tajime.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/norawokufuburisa.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/giwisazofeguteg.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/berama.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/68154874604.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6604f2dbc---mixadixujuvunidavo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/medht1cl88r307kn1dioj6886b/61663591550.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/acc18d4f8bfcd4d8b28579e070afb98f/xajel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=i+will+be+there+jackson+5PDF 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_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 16552 bytes
SHA-256: 6d4b7b5ad5728189204ded64e53570ae0cdb895333c462071eb665c1c689f1de
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10860 bytes
SHA-256: bd7c95fd6df7a63a8ed6bc43a664a9af7081dfde2eb9b318427463ac1900ca1d
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.