Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faba3661c91f6e3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 11:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6a52a104dfd0510eea937516073d39c SHA-1: 828cda80c493161671af262e966f6ca77deab5b5 SHA-256: 7faba3661c91f6e3ad17ff3c9d6f0531e77bcf0bca28737e81e06b0b0b522967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to link farms hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=play+store+hack+apk+download PDF link annotation
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/futozugewefonubezejip.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nufasowetutidowi.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/26436626579.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9b860e78---kanekudekonafewobawon.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/dibubidutusepa.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/lumadimur.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41383499400.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/fevudofo.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/wujubiza.pdfIn PDF document text
    • http://hueide.com/upload/files/gipupikozutaxovixofojisi.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902050353_1658564135.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/zuvewofumiselex.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/50260702288.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/98333629521.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae625d59217b53f39c8f17dfe4e4c3b5/sobumigipipezopox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50bfcb3c8a3a3450e7750cdc8a5b2f08/xebibigosuxexezafunu.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/39088668239.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/29770932893.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210902093830.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xobivobesanavuzoxuli.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16568299394.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/15973348437.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/799d2980dc70ce538dd37c9d0ac646a1/ramuvelukodiweteni.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/44623305688.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/nidujisavofamid.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 17180 bytes
SHA-256: a8f40d12ac2fbed9eb11617f36a30478f136ba05f862030df8f4b2f4b133c131
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10812 bytes
SHA-256: eeddaf343ce96e6d448bd9bd4e20e40ec461237c4ae88f88e1765ee29594ee03

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