Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d304ca6b883209…

MALICIOUS

PDF

115.8 KB Created: 2021-09-08 07:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 392b768cbdd05a85d97c5544ab8e2dd8 SHA-1: ceb740131f6d45ca569e9815c93f2f356357d262 SHA-256: 74d304ca6b8832098489cca1b7d19dbbc44463ff9a4017095ca685ac038ebf8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zovsh.com/Uploadfiles/files/14372914492.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf098d455---59546241160.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76026bfee---4284024088.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/12304253396.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/jajusepevizaxemorega.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4152d7ea52---paveduka.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b0f140039f5eadb8ddf71e535df9d366/43073200285.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404b25f59a---lupukivasebuzip.pdfIn PDF document text
    • https://kultmotor.hu/images/files/luzamimopotula.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/68633124985.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3f1f3e383e3ef65f3c9320c59503a027/34972733533.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jowuguxu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/foxozusomil.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/94710720086.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/rokamagesibuka.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc2331629---wowonefazewifamafus.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6432bcb24a---pevifavawoten.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/92965532811.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/95204536973.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/pujiso.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e68d6822a---difetel.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210529_214710.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/subalitugufasujapifovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=faraday+law+of+electromagnetic+induction+pdf+downloadPDF 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_off00015a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9A 11072 bytes
SHA-256: c599df64a7e457527119968458a0470b5e43dae239385f15764d91a92a1f73e9
font_01_sfnt_off00017432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17432 20040 bytes
SHA-256: 39a5eef9b2fba76dcb75f4b3d7e96a736da63a98cb33fba0dbebd35b777249c0
font_02_sfnt_off0001a8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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