Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3aabde50c4e31e…

MALICIOUS

PDF

79.2 KB Created: 2021-06-21 01:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7acbdf98cf77651ace260c30d3f9a0df SHA-1: a12f2a7bdf15f6000e1935772d22083f76d8ff9c SHA-256: 4d3aabde50c4e31ea6b8c802d15879e78832e1be16940f7ce228333fffde8788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/uplcv?utm_term=vba+right+string PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071263487c88---xibugumaxuditalam.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/825444210c3682d1fade34918957ae16/jidizi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc81c035cf---29730881559.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrial1ogj8tpkib2ik49mkivdu/furezuwala.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/1913346538.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50595879074.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fabuvi.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kedeluxofinu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc48fbd0bd---22739966197.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc212f7aa---vurilolazeg.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/65695969798.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f0bee7238a---xolemego.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c161e5c2e7---rugorijuxaruru.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5020 bytes
SHA-256: 896f2ab136bc6e582b7afcd2bb14ee53485ca63a0bf4ca072dcd9e787ae66a3e
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 11560 bytes
SHA-256: 412f45e89c1ef42866ffcaf920cc3241a0e9c832c409e535d4dfe090c11d35c6
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16232 bytes
SHA-256: e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62

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