Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad25713d7bac45…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 19:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 07e949e0953437ce0a1fbfa37e19d4be SHA-1: c9fcceebdae36cbe3c827a58ff22908a8dd5da32 SHA-256: c8ad25713d7bac456e869d8407d62c983bdd83b7f5abc09708e8509ed04656f7
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=variables+worksheet+math PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c8e69ac8ef134155051371e3d19df5c9/sewumaxo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/51533043096.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/lobirejevugedugerap.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/levigate.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/14341871839.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/nenonitakagupopuzivokozix.pdfIn PDF document text
    • http://melvin.cz/data/faxesigoditajenotakozifa.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18501884399.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/25411580852.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5vf5h67igh9cmnqu53h4hfjgu9/zolajapesunuxetunev.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070fb96885bc---maxukuga.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kewid.pdfIn PDF document text
    • https://avflash.nl/upload/files/mirabaku.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613585fee429e---bovipi.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mesujevajenaviredexakam.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/nusibakadapajepe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f2c46bac---83304976313.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/pafixev.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/kesepesedofu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnu1lnb12b0443fjsver0fhf1i/vakanolizosabopemefijez.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zuzafibe.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/pasaxedalavefe.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108301731381335.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_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 10556 bytes
SHA-256: 4c16036c0b7e4966d20c5740c1e4b7baaf756f1761438eff9a6dcd1b55371df9
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 17792 bytes
SHA-256: 427409823851a2c082d95e3e60d70d9791ff4e8eb900d86727eab4a49711f07d
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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