Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff90bff52a62431e…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 22:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c529cde65e891f329faa46eea22017e4 SHA-1: 5ff955ebb49f63f50f933a48b0a6b34d613007e3 SHA-256: ff90bff52a62431eadcb9c711c30d02c12aaf749d6273e8a4598b5b262fe3fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=how+to+hard+restart+iphone
    • https://lecormier-menuiserie.com/www/upload/files/54908633804.pdf
    • http://cmtsport.com/pliki/45894282708.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/431ef25c6259c0584de4bc570c803af7/nunesaxiwetozusorugubov.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2555d1b92d42ac502a0eb445fa0ff95/muserezerovik.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e64d36753---podilozojopebekena.pdf
    • http://ainut.fi/userfiles/file/43268024606.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e8b7c1a38---dufimaneboteginagonovif.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871477cf307---23880631232.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5886af2e---91101628547.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/bk47e0rh6fae0mact8c7chvu7l/49578176649.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a699c36e14b---65639997242.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c020a0aaad9---pumotetanasevukazow.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a3fb94834645ef33951543e5f931e732/fekabarumuvikonedo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc17a7ebd3---riwoki.pdf
    • http://tele-video.ru/upload/files/pawawivorujurob.pdf
    • https://aulacvn.com/upload/fck/file/wijivisibomunif.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ah4h3k1tdk5kkt4tvib193du0q/92715615560.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l0hk7mm2jqcr9snk35k835pb07/wonowolujufikoluvotogop.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3d2dc4c8bbf927d2728036426c74d489/rinunin.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hb9c1626j43sor5n6akj85ocsj/94693722201.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6748152d0bb41abbfc3b996e6f01f538/4287298799.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_off0000e1fc.bin
38f8069a1de70846e040bd1763426f47a1e67047026f89236b188f5a80fa18fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 17520 bytes
font_01_sfnt_off00010fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes
font_02_sfnt_off000127f6.bin
7ecb7ba23a14f27ea3a341aed5cd366ab2d41ae2af0970cdb486234807a8eb8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 10520 bytes