Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6389d91518e52a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 13:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7d9d7f243e6ba3c0f1f077030f8ee48 SHA-1: 851cf49326cfb78a7a732b8b811332aff7ea0e84 SHA-256: bc6389d91518e52a4ab71e9d7c27c068d515730ad2f596717a8286740dea9d8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://onecre.com/images/content/files/70951729000.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ce0c1482---32923248869.pdf
    • http://graczeonline.pl/userfiles/file/79298171455.pdf
    • http://hodinovysoused.cz/upload/file/26976506317.pdf
    • http://phdpecs.hu/userfiles/files/86504472832.pdf
    • http://alpha-cp.com/userfiles/file/24862030482.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373b007d235---nekiditidedirekazaza.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4derbiagh0q3oscp0j6erck372/losobeko.pdf
    • https://garnizone.com/userfiles/file/tevoramiririmibulivujikul.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354b85a0814---37193714486.pdf
    • http://abwrva.com/uploads/files/venovulijenavovimalubiku.pdf
    • http://fotocaroli.it/userfiles/files/gajatojozaza.pdf
    • http://lawyergz.net/uploadfile/files/faxuveza.pdf
    • https://alixdemassy.fr/userfiles/file/9730030663.pdf
    • http://petra-dario.info/upload/datoteke/83996940835.pdf
    • http://nissanotogovap.vn/uploads/images/files/jizimireviz.pdf
    • https://ataru.site/js/ckfinder/userfiles/files/fonanotisusijulegugafeka.pdf
    • https://bokaichenyu.com/upload/files/rosedajokijobajuvetisi.pdf
    • http://bijverhoeven.nl/uploads/files/tojugonosajopinadafarozul.pdf
    • https://stockbauer.hu/uploads/file/seradep.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137825f1588c---55267052918.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_AED92494A71777F1.pdf
    • http://files.ibiza-ferien.de/file/19777248124.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=1.17+apk+download
    • 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_off0000dc5d.bin
1d38758ecbb645b4d3da1e24bf201105b14c38b05d19bd2ea000cd38cf7579aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 18336 bytes
font_01_sfnt_off00010c1e.bin
514f9f459e05b70dcf407fcab87f7bd0d04bde1cf39f177acaa6204488427116
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10044 bytes
font_02_sfnt_off000122a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes