Malicious PDF — malware analysis report

Static analysis result for SHA-256 99292079d0ed2f83…

MALICIOUS

PDF

80.7 KB Created: 2021-08-27 09:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b9c2393d7c3d90c7c28cacc713986c7 SHA-1: 9f9a1baa73c454ae74498e493eea1e353bdfec3f SHA-256: 99292079d0ed2f83ffc399330915d2978eb8fa0ae0177a28c2eb049d9fa9b5f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=assassin%27s+creed+odyssey+sphinx+question PDF link annotation
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/nn13j13e3a5217reoeoab92er1/10114960031.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/nizepolozagevowig.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/22772007429.pdfIn PDF document text
    • http://deltools.com/userfiles/file/dozam.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a532a73aa3---tepitoliw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae811feb4---94217363121.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db0ecb78893f12e7a7db741b949012de/97792925339.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/42863386712.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6118389f1dc3c.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f5d806eb8eb0d97e8766ebb3fdfdddea/kutox.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d875f34a0c---12233213843.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3fc54aa5cedeb61324eeb4cbac01cb50/2782830514.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84fcfd00dc---musukekexudidelazemuvezo.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/kavedusoxegutazuxerem.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/212333425717.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/gevelure.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/bemawoz.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a750e2a0a---50171843873.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/bafonamuzuwurafevugux.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/eae1c8e2a57f4779acb9aba7a01fca5b/3035016522.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4c151feaa9b91feaf00d620dbe25e32d/79391328465.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/7a5e9f60bc27344175e33b1298a72aa1/17404132333.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4049a4fc---44244227931.pdfIn PDF document text
    • http://leguido.net/files/62746363335.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210801/16277889241177.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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 11044 bytes
SHA-256: e8f1f16de25e5978507820703a1e6731f5fc241d1632156ecc8a1a0ac14bda37
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 17024 bytes
SHA-256: 21a403f55cc31c477e806c7233f70edc32175f1685f1cd0e73aed10d56e8afc3
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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