Malicious PDF — malware analysis report

Static analysis result for SHA-256 b995210c744ec7f6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 16:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b5c5dc977cb96d8f4022d5fc3711462 SHA-1: 021db84b77c9b39ff97b680a79c150e32ab4b9df SHA-256: b995210c744ec7f6b2d9edd0f2bf58687a9c6f4bb12a8dc49d173e49303a784a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning scheme. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent by attempting to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theipbuzz.com/images/file/4912313811.pdf In PDF document text
    • http://levotst.com/uploads/files/66143489258.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/6346667045.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/20026210903.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/91352670173.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/munudin.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/zedozurulomolizipabo.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/zopesesukarebivojaz.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31816418640.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bobevusawaribofu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a51a4b89d---gimitofagimulusemisenagag.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc76eb316f---xasojotixasus.pdfIn PDF document text
    • https://sim2007.com/files/50570946566.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/37905553302.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab54d4fe76---xupuzogaremugubumeratopo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/xorafipo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/84151014778.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/28692054577.pdfIn PDF document text
    • http://humanlitech.com/files/files/10767074688.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109181230418212.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/48536005779.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/74819713958.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zumevojepujata.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/37991803004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aha+telugu+app+apk+downloadPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/78208492209.pdfIn 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://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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 22692 bytes
SHA-256: 29d24b0d798178afe91c82c8df9266197f53d311032ae609e2a243613f029bec
font_01_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 10572 bytes
SHA-256: 91e9b807360aeea795a14132864ba202b20fc065fcac8e72f2e4fa93f30847f0
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1