Malicious PDF — malware analysis report

Static analysis result for SHA-256 157068a6b0383d31…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 16:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17f44baa28273258f701e8b9c4fc520f SHA-1: 392cd93ca9291aad42975390daf474627df97a76 SHA-256: 157068a6b0383d316e1a386148f92e7c1849db4c5fe36531d7be51999c145086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=let+us+go+boldly+to+the+throne+of+grace
    • https://lexconsulting.ro/webroot/files/media/vugonetitadizopepexopa.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/winakalusikexemapafog.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/731a7f3a39334c77869aceb8708319f2/zexuses.pdf
    • http://ranaghatpchsschool.org/userfiles/file/zutowatatelupimeputumox.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442e5939f7---papenegokuborino.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgsvt1ejii5kvij8kr9v19hooh/42841535586.pdf
    • https://bakwanudang.com/contents//files/59428335016.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92uatev4sl8tfed1733kqfpgf2/papixamulakazepiga.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/taluluduxeramumone.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522072022443720.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade4b352956---30559818446.pdf
    • https://afayl.com/userfiles/file/82448769874.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a6c5d529031b9cd3cffece2097c2243b/1989494933.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/wipiwenokogipirilibegan.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0002d2446d46b4950f55260b3243f362/womotavizu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16792 bytes
font_01_sfnt_off0000f997.bin
4a16684f4fdc073ea0d1a86d25ba947ac61e2cee44190b2abc6063bfb6ef8484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10972 bytes
font_02_sfnt_off000112dc.bin
e65e7574abfed0293d87bbf598fbcb70a4e68eeab1a781d5a84e49eb1290add3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 18520 bytes

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