Malicious PDF — malware analysis report

Static analysis result for SHA-256 8956c66eb33a6312…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 04:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41fbef98d899099da8edd359ba4eb461 SHA-1: 03284177b8079750a12b776dba6cb25bebac0003 SHA-256: 8956c66eb33a6312b9f57424cbccc2209344d4e17723eb6fa3e5377a376cb274
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079968566488---bokexukepatasova.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f345f99f7d3ab280e3b0345cf0c30d72/wagujatatubejuririmimewuz.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/20513030333.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/66239798962.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/xexususawinonavorar.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7244808a9---kakofurisomevuxiror.pdfIn PDF document text
    • http://giustofiori.it/file/dawovajomu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160972087522c7---fitedugumawebelugeper.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/35731462927.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c8ce7c24892b4aac07b74289dea92e3d/logezumuvijaxunu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/72898923422.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/seraruzeneniru.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/96347914639.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/15351842568.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/93019655073.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/de1e52f8c9a9253cf32703787ba78f52/40557638613.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/59372204b6704d3394ef16e8cbc5538d/40846477922.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b901e60ea0---ropegelij.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/murodi.pdfIn PDF document text
    • https://people11people.com/uploads/File/dodosofuwu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fd01860a2d1a6ba2d6746f998e753f8b/gijizamorovosibesoxa.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/14449321988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=alif+novel+pdf+completePDF 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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10396 bytes
SHA-256: 65f8f831e11223c310d5c12b22d31674429105c9b4499d22bebba5d02e15dbe7
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 19196 bytes
SHA-256: e156dcdb73dd571f88f8b5f102d0a53e742ac50cca2534f7e232cb5e8611004e

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