Malicious PDF — malware analysis report

Static analysis result for SHA-256 250185aff8b2e2aa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 23:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af291932478390b63c7f794373377936 SHA-1: 71d872b5ebf90309a873eaba23477a28ace26a63 SHA-256: 250185aff8b2e2aa7ba6328f721dee9727d697ac10ee2ad44bc1d5590395d18a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further payloads or engage in phishing activities. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://charteriraq.ir/basefile/charteriraqir/files/poridusaletunediwijasodi.pdf In PDF document text
    • http://backkwang.com/userData/board/file/30042461809.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/soguduwokiso.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/85533483566.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/74867621659.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/fobijuxiwajazujezupa.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/57753648937.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/98132440413.pdfIn PDF document text
    • http://poorclarescork.ie/images/juzigexazezanumogex.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/lagedagamoxitadadedirive.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/zukenefukinovologu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1875b0e5cf99739a339976548d2e01cf/90856735652.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vugopenusubowofukir.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/25325429671.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340966e50d3---ponagumejipetovejijoxox.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/42675520520.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc01fd82e5f1537b0967cab7a67f5622/fidurifamurebonelege.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/96662194948.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/87107340189.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/63486732055.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/17407049962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=use+of+english+b1+pdfPDF 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 17660 bytes
SHA-256: 87d8b80d354e1063d07bd7b148084ddbfe7eb126d38602a832da74bd166a858d
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10616 bytes
SHA-256: f26c0e1e82197472521edc58717165537d9e9c0cd5ac9f6ddff7a8a0b98bd41f
font_02_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1