Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cb3b39a4c96290…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 01:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 521e2150ee0a9684c5c5ee483cc1c7da SHA-1: 7895533a887427e0c542badee491e7c9e8c76524 SHA-256: 26cb3b39a4c962905d7ac56375d482ff97046fbf60ba19f68c4c7bbd3facbc57
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://33mobility.net/uploads/files/bogokuwivuzizurugejukuz.pdf In PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/16560437555.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/putedesopokarinosif.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210901161131.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/26535662839.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd616d591d0d8f30a1d083752337fad2/pobewobuwejatokab.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/29093246817.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/12743267557.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/45518204491.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/widimav.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89754f42---56645898320.pdfIn PDF document text
    • https://equalland.com/uploads/File/13843488931.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/33227614161.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tog2dvng4rufj37gf3re5v12u3/26959428043.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/79400155625.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/dowetodirepomezezituniwi.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_207B2093EA514355.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/8947d3.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lugerirutupidibu.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/tusoworolejiruxirefamerug.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wajapidovit.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/werawewifafamubole.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10d593719e7a5db114cae4cb8b2ae2e/zameketogagivuvinujezuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=new+movie+torrenting+sitesPDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 10372 bytes
SHA-256: 6b7a22fa513cf257c69806e299cde112d9b226a6cf2ac269979daf1d088f9eab
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 17800 bytes
SHA-256: 5dc8f663d4de2aa0168dcfdca5b307f73e3c5674bb18636b8c20633a57a5f7a2
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1