Malicious PDF — malware analysis report

Static analysis result for SHA-256 3108d9d7ed0e86eb…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 02:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 039b0f865c08abe12a463c11591ded90 SHA-1: 9fd7e5a05839c3af8125676218daf0bfbd48a9dd SHA-256: 3108d9d7ed0e86eb86a1b1a8ccea4e82b5a472fdf7099ae77f71413667050c31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a high number of distinct hosts indicates a broad redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=best+football+manager+games+2020 PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b889c83c1---24915932122.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/1344833783.pdfIn PDF document text
    • http://3sdent.com/upload/files/84821598750.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/05ad76cec104ba0ecd322b907bed0232/lusikasepulitozazolepepa.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/5434292045.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/munegirofana.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/voranifawowara.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/13491056776.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/47249825724.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/wituseb.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/92064981148.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907100901211408.pdfIn PDF document text
    • https://pmms-online.com/assets/file/69255012238.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161360955b5fe5---nuwuxavu.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/39625656459.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/65567041523.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/62783576310.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/45914637655.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/82122934525.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/72545798211.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/53378656461.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/xarixoluzize.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 17904 bytes
SHA-256: 39e53f7a24ec538dbe949aa5ab4074109cda971e7fa824e7c0669dfd2d1e8899
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 10900 bytes
SHA-256: a76769637c6982f04da507c67aa9afdeb90b6ff0237a8ad8302bfe69b2ada7e0