Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a6e82c6af1af01…

MALICIOUS

PDF

77.3 KB Created: 2021-10-06 03:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 761396815ce790821c34a82490159c6c SHA-1: a4a1956d9fca8c58301a7e7f1d889a57b3865c2e SHA-256: b2a6e82c6af1af010daced2f723fd946e428e4931e290eac8197b3340c0e4427
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lawweb.info/mycms/admin/userfiles/file/11909896970.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/93d4f19251fc95700c5920aedb067799/fikeliluxoramulev.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/getepifemofizumagu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/legusokixej.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/70733031838.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/28998877838.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rewezasexuvimow.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/wijudi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8bb3491e---26566724036.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/29696218619.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/powavipetu.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/23151921995.pdfIn PDF document text
    • http://vuason.vn/upload/files/gugebedabowufo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7cfa22a076091cfbfb75537b6a3db47c/32154342336.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/57516279462.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/guxuzitejufirikuseme.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/jogito.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vurepozenavudav.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/38535583565.pdfIn PDF document text
    • https://airxps.com/userfiles/files/sadikivupudigemug.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/butubudukuzagugewil.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/24507358821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=covert+files+to+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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 17384 bytes
SHA-256: 0bafcf91f1ff3493255b0851c3280f88e14c3c2fe46bfeac49f1d4449dc14eb0
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 10324 bytes
SHA-256: b6a6530f3e9d565c61921eec1eebbdc7e84aee63b9bae1bbb2c756bc6c200000