Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b43e5c83a50e3f…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3aac16646131cac466d435099663c5e SHA-1: e5cb69f33d3b47f1f71f683b47d2cafedf27a42b SHA-256: 63b43e5c83a50e3fdd6296686274f3ceb034b4b2931330e0b9a80758e7df3683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=time+has+come
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a738c76a978---50500906762.pdf
    • http://indecomavo.pl/inc/41029071801.pdf
    • http://mmprogetti.it/userfiles/files/44329411900.pdf
    • http://studiobaliva.eu/userfiles/files/54437111098.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084976049bbf---116316326.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e820da18b---torovegize.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4594bd16de---35850176935.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/19c9c2020966b2babe70cfa14f2d5524/35275733976.pdf
    • http://dges.in/userfiles/file/tomuxewowaxizajipepiwar.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7sq7vkdvlhtgeh47to0fddssk9/pevetizamununu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321ab95cb4---pupabini.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086079672caf---36318867949.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58be71127c---90967057833.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6906d1ead---55024320286.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/14208353984.pdf
    • http://doubler-son-capital.com/photos/files/zejifesatib.pdf
    • http://bptramptour.pl/files/file/66608063567.pdf
    • http://kleinschaden.expert/userfiles/file/48337533977.pdf
    • http://fouladsazanco.com/Upload/file/xavem.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a539b9b59ba---wetajisimuvopawaxebotafiv.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607428878ca73---tetapokazevik.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/02c5652becbe69861e8064292b116ef7/42105628953.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ee5f60fb00a6652c8040e00133956778/64790972514.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/56e25b452df52cd496e96521e114255e/33858451637.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_off0000eb4e.bin
d20496aff88b073d96b9c382f1648a45143d36650d606f23ceec937cba6cea7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 17488 bytes
font_01_sfnt_off000118f6.bin
ad07062683001c6b0815e95b07330cef991b89bfc6f2f5f075e419b1e62fb15a
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10108 bytes
font_02_sfnt_off00012f89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 16792 bytes