Malicious PDF — malware analysis report

Static analysis result for SHA-256 089491629b2f61ce…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 02:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07b1c21c342f66a786650b44a2e3405e SHA-1: 60647b69115f62148004601fe3673fba51f338fb SHA-256: 089491629b2f61ce09babe30b6732820786edeeaf5946b858b3641799fcab662
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a link farm or a lure to download further malicious content. The presence of a 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect to such a tool, a common tactic for phishing or gaining unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/uplcv?utm_term=simulation+and+modeling+pdf+free+download PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f8c635aa---dijozilazotopidoj.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/pirasej.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc9cad7ec---gokinomezul.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/42056241368.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/8784857878.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/22401225695.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/33815410701.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mlhsi46vgbddju321uqeuarmel/17504494710.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4326b17f7e---15690592834.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/79512401960.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/jeromu.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/kofawijalomulid.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a536ec6c85c---51997409377.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c127e1e84e20549107fa92b7033450eb/kusulepivo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/80325f4edb322f730a101b2c82cf511b/kevowotilafodonasalegeri.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/90766261396.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/920b53104fdd0fc6e1ee7ed1cfb70c32/vavebereferifojovonolik.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c619cf47de9---nafadazufopulosuxenosazum.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd1beb5c4---telokedozebifejelozuvuro.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/49713479510.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/nubidabava.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/91853885771.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/15ad2792ac5d31fba8b067f3feae2d15/66929354240.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fidoxatemozapimifilunolo.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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10936 bytes
SHA-256: 2c4126ac433ecc724d8a539f0483274f203bb5389226bc6e2c137a69f152b16d
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 18064 bytes
SHA-256: 7c6ba5efa4f7aa3d060965e051ce13bb3a81d2c477b87c5d67474c8b26b97da6
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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