Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e3b39a9b7a1961…

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 19:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31e6ac452c9f700893fdd7886c6ea1da SHA-1: a9d7c535eff081fa4082b4a06de09055e680f8d5 SHA-256: 96e3b39a9b7a19617adfc382b5983c30030f510f3bf5a763964c491cdbd849bd
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 as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of these links suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://inwebjor.ru/uplcv?utm_term=para+que+sirve+la+pomada+de+bamitol+con+jengibre PDF link annotation
    • http://asokmontridental.com/userfiles/file/niladefemo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec95d45a67---tunezaka.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/30733498988.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/22358226713.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/53803175434.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b9085f2804d3e3bba57b42c33289cb65/85938266814.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607902d5a70e1---35099255863.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/ninapuw.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/1b0b697ccea38ae89c4e29ea204caa88/94711137401.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0ptikvtij1k8tlip2ni30i835g/52048934941.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e33f78242---3100447414.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/teporofomara.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/daa812ffce7142b603f3a10c47a18a7c/sisisipoxarugopevez.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2u7vo5p9gu7a1bv8uitss3p3q6/15145352381.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/ripet.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/timobowun.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/belotozojavapubozufabe.pdfIn PDF document text
    • https://doitoutdoorz.com/file/kQYR3RhA4ZoYXcIP.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e92c4309---zegejozafakire.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907fe59c287---ramegawalageg.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/kaboxumetixaguzixod.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8bfd88632fcc86a3a190cedf57f8ce2c/busukevakuna.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tjeh7kg92mtnpiu11qk4nv0t60/tiwasefarixinige.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_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 11440 bytes
SHA-256: 539b3e04fa88e44a3845ee2c7ff354016555dc187821467ed1c50c2ba3758e8a
font_02_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 18180 bytes
SHA-256: 6da1d59cfc9053e4ee3bebc6e76fc494630b1d5f721964a4ea41fa8743dbf28e

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