Malicious PDF — malware analysis report

Static analysis result for SHA-256 8152a57ed582e050…

MALICIOUS

PDF

101.2 KB Created: 2021-08-01 05:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8fb4ae054f835ddb36884377a91f2f2a SHA-1: 56ddd21ce921ed487acc7cb32ebb1d25d8001305 SHA-256: 8152a57ed582e050081d99e7e975d5a8e7361c0fcee72217f332922d7e3345f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=position+des+satellites+tv+dans+le+ciel PDF link annotation
    • http://thegroverestaurantnj.com/userfiles/files/21763826856.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/81632094904.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e5141db229ba282b1acd9e02376fd86/tevegibaxifekidilikub.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b930f441cc1---saxizujikisagidig.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fbbbab9071c97a63cd12559d4ddf4209/jotakudunumeleguzizuri.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ehu7p2pp3l0itjc62pqo12o69d/67237055708.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ac51ac07---5322443633.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/73fa37a2b1c8f389d7ec8377f281327e/jaguxi.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/10513128455.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3196e161a---gerumudenomor.pdfIn PDF document text
    • http://unsersohn.com/images/file/puzotan.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f29944aa---letixas.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/90159412041.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/89583357542.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/429bf2725dbc1615f3c71f90e875345e/tebuwisaxagixeguger.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/57216149008.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/40547461951.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3102a9563---64261796200.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bq25aqac6gbhc9ajt2v8lc99rp/51061812287.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/10125977695.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tovazo.pdfIn PDF document text
    • http://silver1979.com/upload/file/73636246529.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bcd1a908b---dajizaben.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/af116164ada894fd0175d0c20fddece1/16208390239.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/mopibu.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_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10332 bytes
SHA-256: d21b7cfbcf70cfbc5df08be10e1f7b7feac5c7dfebaa6c4a35c8988a78b3cdb4
font_01_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 19752 bytes
SHA-256: cd3927f884f10370826d5886aab78d153dfa47cbf5ef074af92255c1953839fa
font_02_sfnt_off00016d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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