Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bb2dafbe33a46e…

MALICIOUS

PDF

112.9 KB Created: 2021-08-08 00:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 184a8fd6a7762cc0313c37af438ed100 SHA-1: a07d1ab334f93524eebd77764e371a7ac754076e SHA-256: f8bb2dafbe33a46e40a19d7b1833b5fbd87309812b2014fcbfaf175cf7f9bd34
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=resumen+del+libro+de+la+culpa+es+de+la+vaca
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efa88e00b---50349379657.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/93709998493.pdf
    • http://chiengthai.com/file_media/file_image/file/nopinidigadopetijeg.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f202f01d7---diwelipusivegida.pdf
    • http://ceskylakros.cz/userfiles/file/naxizonovuseluluxasoga.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/0ou4tau70d4vc80mt8nhfjn065/12927049491.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ca1262d0f8c62c861a24a3805a284fa1/27141989358.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e21027aaf3f---21111035689.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/98cfb33112cf72da8f11b51e6f00f51d/26765781775.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b25cf0b28---51623339229.pdf
    • http://hangquangauto.com/files/69438281345.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/66f8eb83f5a49f776c2f72692660751c/daxaxom.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdf
    • http://bestbelly.org/content/files/files/xanulawut.pdf
    • http://klubalfa.org/img/userfiles/file/dazazusunenekowa.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8fa5732a---74999843506.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210731_8DB5796E7E733D38.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a6d590ffbe1ecbc8dad2cb5669cbd718/lepopulewitavi.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/18be434cb3d92841b317a80a7f6fcc72/salimilazaluxemanup.pdf
    • http://acpiindia.com/userfiles/file/69976215832.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/27f2cb14626cf9ac0535f15c88cfdd9f/46627783659.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/p2ppi65upj4pkhs6luqcnipjv0/86092449863.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e6afc5d8fac---dajezijuxo.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/84c250123e41fb9d49e1acbf85060680/bupuz.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_off0001540c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1540C 16792 bytes
font_01_sfnt_off00016c23.bin
01426b6342a38b7c47a22453f3b5583b6275215d2cec3f0271c4ecae5b81157c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C23 10928 bytes
font_02_sfnt_off00018525.bin
eb7d83d2f1a29a90f77f854262545142eb2c6f46e762ffae5830b0f22074efbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x18525 19156 bytes