Malicious PDF — malware analysis report

Static analysis result for SHA-256 529bf8d37c412db3…

MALICIOUS

PDF

100.9 KB Created: 2021-06-20 22:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b21e279100aba0ae8a075bff9cd6bff SHA-1: 13be5ddd2263b2109fd81a93e7d6f8d5b9af828e SHA-256: 529bf8d37c412db339a5743d862d040b1b3f217dfe8766b06d3d63aa619f351f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=movie+porn+story PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/13ov80qnovi811u6qdh8t62h8u/2514526838.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098c19743951---2624875628.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2fi5554jbe44hfv3k4d7odoo0b/11025308001.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/22e583c4b4949864a7e8a2f9678b6280/81453249696.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/3796789918.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1e21de9b128624606ea4b916e5e140bf/mitivegobuwufumewizinuna.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/26695320538.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6993543c4---97631595994.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tawikabobus.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8b06599a---39511185607.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tcam4ufds9vkveb50i81jsu0fu/54693547008.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe1e20554---89605124360.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vulovoravasup.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/vagonafegunagizod.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/addc69676d57a590bd3f318bc45f366d/6410178283.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a728776b41---rilegakogol.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1ed8f666d6b96914fc4701204620bc64/vufuvokolomukizafaxokep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000138a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A7 4736 bytes
SHA-256: 755fefdf9a2b839fd6cf7d2aaa8259fbc92c9f7f67490917fb8fcc0046a8596d
font_01_sfnt_off000148ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EE 12192 bytes
SHA-256: cab1821cec888aeb8e68ed99724157a46295c02ad862b5504d78a2e7df606a6f
font_02_sfnt_off00017142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17142 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15