Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9629262e216f5b3…

MALICIOUS

PDF

76.4 KB Created: 2021-06-14 04:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 790df488d153c5e4c1b5e8ab63f76d7a SHA-1: 87fbcbdcc150f0fc78a67eee6283e5ce2c00e39d SHA-256: a9629262e216f5b3292420869978a042c548bdfca55618e1a2b95e805a07eff5
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=how+to+force+a+restart+on+iphone+x
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8l61qqiqm2p0j8m97a0tj63koh/najasejeroli.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5d9c35---19530598746.pdf
    • http://asesorgubernamental.com/images/file/37042158997.pdf
    • http://suamayin.biz/userfiles/file/nabelowuvozixigupabaxutet.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091386b7e44f---51440688064.pdf
    • http://poolprotektor.com/userfiles/file/10028798243.pdf
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/5742334319.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdab4902a7.pdf
    • http://crm333.com/documentos/file/jazorojebazikop.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084a477e2f92---votamumofixabizigoledo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088560392237---jafatov.pdf
    • https://lionkingbali.com/uploads/file/pisozesuwefu.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2a0d1e53---pepigol.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5a9293bc97671d9e3d9c7222a4895375/40351056939.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160851e67d6fa1---dajodikoweje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin
c463391369c68ec91ba05509b249ec3ed0f977013ee6850383d82acbcc43f472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 5192 bytes
font_01_sfnt_off0000fdb7.bin
51a287442176ab908ebdc50b5bc0ed630242603f3b35c38ef4dc619f8e2ed37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 12316 bytes

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