Malicious PDF — malware analysis report

Static analysis result for SHA-256 0469e473c434c844…

MALICIOUS

PDF

99.2 KB Created: 2021-06-28 05:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c442422d1675d904c0878a6b4c97382e SHA-1: 7ca72ccbcf07257068980c14b275369bc0a4e1a6 SHA-256: 0469e473c434c844f7765864d6f4258b4e2d22482109dd4bc233b45483820d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in URLs indicates a potential phishing or SEO poisoning campaign. No scripts were extracted, but the PDF structure and link farm indicate a likely intent to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://ketchas.ru/uplcv?utm_term=mobdro+gratis+android PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7jees3rbt4dipdv2ajggofknae/25007960338.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210527224415.pdfIn PDF document text
    • https://thepainter.asia/upload/files/52352312488.pdfIn PDF document text
    • https://aashianarealty.com/file/xawuxuvuw.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b634a6d2212---zinavijid.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9f8d9914---44877923975.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/79573875336.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80dcf1d54---72741534126.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077298f82999---1103180045.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085060aa6e11---sukebimuj.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/925e71229c0f74f619144e551507dcc3/bubijififowuwakofegavu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/182a32d996ce0c82e227207719396647/videmotanemasoz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/82952227.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af662347155---rolodetar.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/47466050820.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d38n0hfetssun5i2m2oedteq4n/91523915652.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a11c2ca15ffabffeb29c81eb77ef3619/86006160397.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c33174ee2---81257367375.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b71e73207c481e57d3085aab5e217165/87956668428.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/89836269378.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/xivedefaremejut.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///48996243277.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40ef0991d---janagatumovaxifof.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/wexikabujaxatizu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16296 bytes
SHA-256: 74500ecad152a44c51f5c1292d5446d8e22e8f15e4e217f744a313b11729e5b6
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 17552 bytes
SHA-256: ef7d5ac1a7939c5280fc926aae2a76d86ca025e1f324f924d752b509a8c1d161
font_02_sfnt_off00014fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 10376 bytes
SHA-256: aa368930a03782592dd5a6fd960152ce17c56d6fff113d1a3817ad451456a1b3
font_03_sfnt_off00016703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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