Malicious PDF — malware analysis report

Static analysis result for SHA-256 3744013e2dbead97…

MALICIOUS

PDF

89.9 KB Created: 2021-08-08 07:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fbb7b5862822b90fa9054d922eaba38 SHA-1: b733af00430a8c0ab55f7a7bf41528f2783ee7b6 SHA-256: 3744013e2dbead977e90a05fdfb843ae949a8fce100b11f2cf5df0bc904ef2f8
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs point to a link farm hosted on potentially compromised or disposable domains, likely serving as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://airflow-skateboards.com/upload/file/filitefep.pdf In PDF document text
    • https://semagro-msw.ru/pics/images/file/pitogexi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/78575393728.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/ditazuzibipipotegerired.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/gevavuroxabigepipov.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/mivogebupixenatavavemobif.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/753cc768a0bbb9ac3b31760188f6afa0/xabukiwikofesijemava.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bced44486bf---momupa.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/wopakajimupedalulibelepo.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3975080853.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ded270d7b---95422013919.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160801c8842510---8506587450.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16100aa6d0f4e7---30744972746.pdfIn PDF document text
    • http://www.asslar.de/downloads/kawipod.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3ff9438d21f08cc8e0bc1dbd717d7b72/topatu.pdfIn PDF document text
    • http://www.grifin.sk/files/69978096344.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72c701619---53472719644.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/68117776117.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/vemefanajatezomutuvexewu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3360f6c9---68555770909.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5a239bf7404312afab16c7b2eb7081fa/66824142685.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/936aae3cfa60b467bff7bcffd91b7977/pesowez.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xedozapiwijoveludux.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/71332670439.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/76251055054.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4c028b27b---96100994960.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094eabe9254f---1149298494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=avast+internet+security+license+key+freePDF 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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10560 bytes
SHA-256: b7f872ae134effc82c48dbc67caa5f0599c53a946c81ad1004b59ec91bcd48df
font_01_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16632 bytes
SHA-256: 1f76fb0a49d17f65275df96c2014f90e0ec157534c97ea3b268bb2fa595bf02b

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