Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b4b31d25e0da8b…

MALICIOUS

PDF

83.4 KB Created: 2021-08-02 21:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f166a14786786a07a49e7e8c30b5d2df SHA-1: 7919da273d7691ae210ec10f29774e4e6c22ecbf SHA-256: 42b4b31d25e0da8bdc674a3575f7ddf2874f4cf0f8f3faa2b66b60de1c16f09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to facilitate phishing or malware delivery. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=neverwinter+nights+enhanced+edition+android
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160832090674c8---logimixevaziforufaluro.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aca61e372---sozufovoxipujeda.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd83ee308---33437052989.pdf
    • http://faurerom.com/userfiles/file/rejolifabijedo.pdf
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/dakaxazerovete.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608663dbeb557---balutadivejuje.pdf
    • https://cottonweb.net/userfiles/file/35969173593.pdf
    • http://clinicoral.com/img/userfiles/files/badikulilupidafanup.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bafb3ee69---lozapi.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/648d52b3098538348812960e1403475b/mojixulamagiwokiko.pdf
    • http://pphu-joanna.pl/fckpliki/file/43648933558.pdf
    • https://clinicscrm.com/img/files/84216945697.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ciaj68a7o8l76q3jje5f3v213p/xajamuzepazo.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8775a83d9f5a3f918ab9a509ab17aede/xanejijanozo.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a270cf2812---sarevumakifetudesekanajo.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e4a5f7b0---zopofoziwuvadoludipuvizex.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/62480670040.pdf
    • http://bike-aholic.com/UserFiles/file/44531457191.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a10414e4---fifapimopowuxusirogijidum.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/22215250120.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880d436460---moxatozede.pdf
    • 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_off0000d3a2.bin
1fc87cdc51caba6c0c844516189aa37b2c207807a9a1548377826b794930123f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 23156 bytes
font_01_sfnt_off00010d0c.bin
ce0ff1b406e895153ac09cec9b32d694d036b6999314b7cb70f3708e7c108cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 10732 bytes
font_02_sfnt_off00012588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes