Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc198cf4f8a929a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 16:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12fa8c61f0de993d3b783852cbdba5d5 SHA-1: 53356c2847eb6f583efc0010ad2ca3481c28d7c3 SHA-256: cbc198cf4f8a929abdc7293ef6c8c3aef541d64b7fdd9482932361d1d7bb3a89
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://geodavidepini.it/userfiles/files/dedafolop.pdf In PDF document text
    • http://indianspringhomes.com/userfiles/files/mudefemaroxatoginebitof.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/11574316081.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f3d0704e6e7505ab6bd07165ce74a03/zejunuvosexozuxijap.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_1620F0D77DB19917.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210907112654.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d42d190297ded867c97ce6bf3042f90b/8986315350.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/pinajigaguvawosesusijiba.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/98762436.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/tozugovasobapirojemo.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_164728_166.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gufobezitajex.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jezenixeveripurobosas.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba5c6d04e---tipezarowuworusa.pdfIn PDF document text
    • http://trieuduong.com/images/Download/lagozoponoxiki.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/82000346787.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45758287604.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/16304796261.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/pifowi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ef3f6a9---1041445347.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/nepevuvifawuf.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wamiwemejijekegedamuri.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vivuxebikonebizika.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vruq4hsnin9ndecslcr8mfc298/87642314824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=roblox+generator+no+surveyPDF 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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 10756 bytes
SHA-256: 8488c9fc24c760cf9abca280656e9dbdfaad3e8f6f4493a03cf44fb0a5374024
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16144 bytes
SHA-256: 21a6ee2bcd073abb3dd0c08e691e0c156ceaf7d9871404afd6b92cf907b56d9d