Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd9f4b56d9e2826…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 02:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd253274e4c772a85fb7834cf1e53eff SHA-1: c5758193cc6743290d1ea0ed8335a2df5897c660 SHA-256: 4bd9f4b56d9e28262c8e8624e54ae9cb0ee397c810410b55ed2e83c84711e7ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=dr+driving+apps PDF link annotation
    • http://jolanyee.com/upload/files/202109250656038872.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/bisomise.pdfIn PDF document text
    • http://willbramephotography.com/89022742531.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/52533018490.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/sejejotoge.pdfIn PDF document text
    • http://balalajka.nu/media/32587975230.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b9555a518a223466d00c386f7e967490/wozabamamalaput.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/20360382835.pdfIn PDF document text
    • http://lex.tj/img/file/7336366119.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/24958486762.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/84014826051.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/84884080441.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/54631061941.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ab89ae9fe116d0dba6cac2c1e7e4d116/84702493892.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/60045247106.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/57007249211.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/tanagunupubejofusunexud.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/wenopodasutali.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/raresunekegigasikifid.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/7304231351.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140050430f36---kotapezusemaxeviru.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/98tktcujonoh6hpd0aqqigbguv/xoxuwiriseletekikegete.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/bipoguwo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fabafe8c---ruguduvalajexizotakete.pdfIn PDF document text
    • 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_off0000b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 18580 bytes
SHA-256: 9f46a47532812c3fe634eb04fb091713bab9f376d15e7a8f49e8384fe1a5b156
font_02_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 10240 bytes
SHA-256: dd0a95ace9ae3a13be8d0c475ed2e96b43a3c8de9753faafe7381ca73ec6b477

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