Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec42697d9f1447f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 00:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 555aa6d0f2dc19f2164a943fb2af380a SHA-1: a04cde8fb9fdb039b702b796d632ad8d608995b4 SHA-256: cec42697d9f1447f887dc0b0c6ec40576ef11b4f9633d7bbd47313cd643310b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://noospc.ru/SITE/files/editor/file/lezim.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4dadc71a1f8c7ad98f785509f90ef23c/buzaxexogexa.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/femeduzanisok.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mdjcs2ij3f8pfvgf2qfoorv516/22597582769.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/97afeacaeb7ca5f039c596795f8d4bee/67372331580.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/wuwufarodovuwupepazemele.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/31ddb3d7de79bcc22e498a389fc0b29d/80220095824.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/28810471840.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/vaxizitut.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cf5aa31a2df21eb176a37ed2ed2a08d3/90051479790.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/kakepun.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/nosifonerinoxabovizas.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/vitelagidiwavisefokex.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa3e996ac4---35988914961.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fd0d6218---64291497291.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/votutewozamajim.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jugoxisixejase.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/6164786822.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/fojifudutamojofut.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/38544864541.pdfIn PDF document text
    • https://afayl.com/userfiles/file/28874513541.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pt8phaoub3ps9ev6h7dj9dp447/wedepazit.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3277916432---93927708000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kalender+2017+jawa+lengkap+pdfPDF link annotation
    • 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 10836 bytes
SHA-256: 09c824c115ed6a5ff59167ba04b8db7758f0a3bc7dbb998f6cb0798c150dee68
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16376 bytes
SHA-256: 536503b7d74dfff58ef1228ed3bbe3da986fedb31961b45a5472610c5ba7d3bf