Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab53cfcdde0e5453…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 18:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b35f2ab7c13c593a0d301e3c80365ca SHA-1: 19114398bff000b21954128aa331ff632bec0413 SHA-256: ab53cfcdde0e54531f82f2d8ec9f7a0d5ffaa1e33046bf9dcf6430d0532596f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, many of which are compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as game files. No scripts were extracted, but the structure suggests a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://poliinc.com/upload/files/bukufuvijijiv.pdf In PDF document text
    • http://keyflounge.nl/userfiles/file/diximuver.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/34007808879.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdfIn PDF document text
    • https://podimercrm.com/img/files/laxezokodefetomul.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wapinufapakajuzomutinow.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/tabikimifoderoxavunanilop.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1064087fd---2274894477.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/18114256675.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/gipakipiwobivunodawexi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e73a6d1659---5421761253.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/kokovevasojipiwaxoxapewik.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/27515153625.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/62656778087.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133da68dd814---51496574218.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/dopomelabatajena.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4o8eb9fq1dehekslams60kopm/10576531588.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/simevodereju.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/28560199313.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/17323422054.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3454669251.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/6129142588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cod+ww2+free+pc+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237503ac1a---2471220079.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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 15436 bytes
SHA-256: dc825b073e2f62eebb233eafa85d0df0fcdbc7b18880f6c842a5946f2fcfdcbf
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10492 bytes
SHA-256: 9612018da9b6d89ef41d19319369fb37eff14c22d634f8c428898ef415b656fd