Malicious PDF — malware analysis report

Static analysis result for SHA-256 33144f43eb62a857…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 15:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec5042d7ff5c149ffd3b7ea0c3279b40 SHA-1: 2f41de53e4269737b4c6ec79abc3f305a51fe90a SHA-256: 33144f43eb62a8579bed36c3ce1de802758ca5112896cd58ac2c1345bc9f92eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior strongly imply an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=present+simple+and+continuous+pdf+1+eso PDF link annotation
    • http://lulanjina.net/upload/files/97589587056.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/44077444740.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/laduxipemanidikujowi.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/kajefevuzonutewu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/499741797.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360229d0369---36218342623.pdfIn PDF document text
    • https://digireg.nz/upload/12134390508.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132f010eba96---wadosotimopurunokosik.pdfIn PDF document text
    • http://linker-apps.com/files/20491227121.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/28097553241.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/zeparosuwu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/dawozinegopero.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee84685e3---43500787804.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xanutaxezata.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/97640936227.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/simaxomar.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/35025127.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vamalosowal.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lexagofuposobeworobaluzew.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/83248025088.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/19763538825.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/29902340722.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/95088090573.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fagaku.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/segisumitexivevixezenopu.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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 10932 bytes
SHA-256: d4adff26e8a554a8043832a2552b285000e8f4ff9921e1ec920ebff2e2e14b4b
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 19236 bytes
SHA-256: b4be10bee225a2f68636d1c07cc15f0570741378d8c714f10113d8c1359ac8de

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