Malicious PDF — malware analysis report

Static analysis result for SHA-256 2004d91ac60da1db…

MALICIOUS

PDF

88.6 KB Created: 2021-07-10 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2cef9e8b7d0ebc32666250ab2cc7826 SHA-1: c3021723fb753263321534bc4bb00e1b74dcfa76 SHA-256: 2004d91ac60da1dbcb27e4f9610f52882c753d98e3f91a3d68f0e2c68e540b93
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identify it as a link farm hosted on compromised CMS uploads and disposable hosting, likely designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns suggest it's a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hoakhanh.vn/uploads/image/files/40803329084.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d787268c---25564281062.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/napeximodokubosideba.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/205ad6c1df4df3f4705bd4a28cc0231c/70203828996.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607c808d53987---35890694303.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/78674896989.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/63bj0lj55ujb5e9tkg5vg2a7su/64004687865.pdfIn PDF document text
    • http://toonesk.com/upload/judodagutugoferixi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/80961572997.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4c5c25021024c75341525ff2241d3338/71399882305.pdfIn PDF document text
    • https://zold-kommando.hu/files/botovimijetine.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736e912ec69---desufononifudi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/10626429067.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5l2rs9s4j8dpifjst3jg9sh5bm/terokepazaremoxenib.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/gipojosetenimego.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d928b587---33643544424.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/24337283442.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b87847be234---pijep.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9a3fcfb---mitinuru.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2ce520123dbda6d0a8339dc231eb22ac/25651741493.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tupow.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/razar.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/vibenepurenofowur.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xubekolibapena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+not+recognising+sd+cardPDF 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 10480 bytes
SHA-256: 478b5a53a97e4a8dc6a911f3af1cefefcf0b0289ed5ab8b89735126b1a75295d
font_01_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 17184 bytes
SHA-256: aee52366b6c10db69530fc7e8055fbd1722da5576d73780b2eadd9ba33cb3803