Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fc7f9617cf797c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 22:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d37519b8603ceda5f3477e4b712bd9b0 SHA-1: 5619e9e472d086afb841de400b97be668b483510 SHA-256: b4fc7f9617cf797caddeda3c7acc675a4e0e2ffffacbde0d251855ef83da6910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many hosted on compromised or disposable domains. This suggests the document is designed to lure users into clicking malicious links, likely leading to phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=tips+n+tricks+for+android PDF link annotation
    • http://vektorma.ru/uploads/assets/file/guxixapekol.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4a89527b7b5fd5baa3a434fea3839f54/xitigudipov.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/17180069479.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/nodiga.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39414613601.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nidunafufabiso.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/wevadarafutesoda.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28597021441.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130681a965b5---galorubikufusujujolibo.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/vonir.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/81778f7dc21b44f8b6767595e29fe5f4/rumutowu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5lrf9pccefk6u6bjaifi2k3inf/77413467214.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///96240405988.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/ramaravewo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f393ad614---62550309102.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/99847661909.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/jekate.pdfIn PDF document text
    • http://schokofontaenen.de/idata/kiluban.pdfIn PDF document text
    • https://12tiga.com/contents/files/nasatureton.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/33f786aef10aa28c319180782375e2ab/4767832210.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908201317745964.pdfIn PDF document text
    • 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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10488 bytes
SHA-256: 2d165fa8cbfac8e6424c956d25fff0bf42c98487cbe77a18422b676c5cc2fd7e
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 17220 bytes
SHA-256: fefc31484171595513f2123f1aa437836b6030ceaa8783df52e896d5410469f4
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1