Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9db6634057c689…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3cec7793e139d91329ae9c0a33ecc6b2 SHA-1: dc8a8411ce32539ab3cc36fedf9d7440f366b05a SHA-256: fb9db6634057c689db05a6e7be44189a8b501b17e66071b02da5f9072c0d1fe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da16310acd1---68242943999.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mbjptpsjjucbn33lnd8apr2tl/6197059907.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d34aab84---vutativekawisux.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/jowona.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/kevosazarosoripuribe.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/lakusabotat.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/topikorigojojatorobela.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/53291438991.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/77302040822.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/95feec4b1811d9c0d257b2eb4d5cde5a/13915505369.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kazob.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/92404d87f1d8f93b836725ecf0cd1ebb/fovijuvunufadididabifesu.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/3160210233.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/xevuxikobofe.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/50418899374.pdfIn PDF document text
    • http://plise.org/userfiles/file/labuniginanekujojad.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/26440352199.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/22697486789.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57420457736.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/gujutakikegego.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ftpv7rcripv3aff74lh4bfjub6/13011377786.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jutilopoxigap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+the+wand+in+minecraft+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 18872 bytes
SHA-256: f8ab95e0900e5c76d7ca9e77f58ae08f3da4c875598c59c74db5f4b54578898d
font_02_sfnt_off00013590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 11176 bytes
SHA-256: d69e48d66b90d1c65df571012b2702e0b8f90566c781b1e1aba5305993be3e93

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