Malicious PDF — malware analysis report

Static analysis result for SHA-256 355f46f175a69158…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 14:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b27fcae21910f0494e1301c836901a6 SHA-1: 8af153909f14795a4f68bec1ddd20211f7ba7533 SHA-256: 355f46f175a69158081cf4e9c8e18087d3dabf38e2453daf6f060316b48f00ca
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URIs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=cricket+19+game+download+in+android PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614028fae71e7---78028825881.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/20088734237.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/nesurobutitara.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nufefukutitelanotesimax.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/40116355617.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a7b26da5ee5524f3fa199da4b5708645/pudaf.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/vanojirelepadaweweg.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/68088455345.pdfIn PDF document text
    • http://wohingltd.com/userfiles/76167247273.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wigizalumuzumumor.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/42155826079.pdfIn PDF document text
    • http://trubaopt.ru/content/file/92595210165.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6813ecf81---nozuropum.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/fonixuzizatibofafokub.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/77502457923.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/netuzalozukuked.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/zipidelumigirog.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rukelifaf.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zawivumumizafevebipute.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/53822799385.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/9820196997.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902030423_rlxhe7.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/kugivotometat.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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 10972 bytes
SHA-256: a45da7e670da41e5517f21a558e6d7e8635f78039c93b34a7edd803aed127f4b
font_02_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 15008 bytes
SHA-256: 856f975ad75b0da175e1287eb333bd7b9aa2144cbdc33b1d663573a06236ae95