Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b0e39cac31a48c…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 21:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 500fcb1aaaf4d42150f1dacdca0da315 SHA-1: 7e0f7be04028ca9abf7cc388d5b6cbf70b2ad37e SHA-256: a9b0e39cac31a48cec701462dbeaf4030a088fa1d32d28d3d1caa50a6b04f3de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on WordPress installations using formcraft plugins, suggesting a link farm or phishing lure. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=standard+catalog+of+smith+and+wesson+pdf PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700c5127c2---sozusaresisamanadigob.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/92739670613.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/27468023439.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/smu02b7grpuotjo7b9el0n9su5/82894770432.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099511db11f6---firanipiliveposejo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa0e495642---11406260877.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/9012624912.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cr982tu67svrcnbaa84fbjpi0/56799504163.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kozaxunirekekejojaxuduz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda089a5a4---60630223869.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/693dbae2fac0c872ef67c53e882db430/rixopupu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa50fa4c9f---71295788283.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0894b08bd---28677397883.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/filegutamuwu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/27cd76054124ed54afadcbdbf4b44c67/xofaxoniwufilezazek.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C66D7564F58.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83de4b0599990ad28721b33bd8e8961e/panaguripevudur.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f26296d8---masarivebofitotaxodatenuf.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/wufev.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/defawijaduw.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/su9ntkhgbjk0kud4o3qnu0oo00/73383161402.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/32325744000.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vedamoxedivifemi.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_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 11228 bytes
SHA-256: 2f48af7a8ccee75d1446d85f0ed53d6a87f6848db9586f68dd9c3bc1efde0774
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 19196 bytes
SHA-256: 2977e7b77f3a6e91abfc188f1c101f168947916e2975b5707745d8c3f4594217

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