Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff2d640101fcfcd…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 21:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c50b725f0a1091373e9e7b9a57a06068 SHA-1: b779cb82dde1f494d50e5f3b3533b9e5a0096fd5 SHA-256: 5ff2d640101fcfcde852f968ae4a1ff3e998937153fd0be37bafff61776d057d
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a significant number of links on disposable hosting, suggesting a tactic to distribute malicious content or manipulate search engine results. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=vocalic+r+worksheets+pdf PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837eea23d12---49202972293.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/deh2cvfvarmutbkv8tci89nnc6/55956160567.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689d0e3ac2---tofewubamoditutibe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3q34jf7sckgqu8bugqskq2l3d1/55734166431.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/fegimutozonepafatubid.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f7d31e5ab3208a16587ab847dcbfd528/genugutovonavumirodiw.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/guwazosekoxijesal.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/zokejozumofiwiwevuge.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/ucbq55cr1f0n8qlnk85om462g2/vomubizejomawob.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tubaraga.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///86706868369.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/36343804397.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/61be279ff951b6e20a5e5946732bda66/vipizinamitukafejopo.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/nozewuzamavofurivigune.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/golikujopivi.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/71403297689.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/aa36e1e26b565ee250d1a6bfdd5b890f/vowurevugagivux.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/valuso.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e10ab6f0858146ed79237175e88c25c4/91739000887.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec9c77cd55---lefifas.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/winabor.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201c7d86dff---16008856151.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/patupuguv.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/polasovupufemurav.pdfIn PDF document text
    • http://xycrusher.com/d/files/zebepokakunibem.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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 16592 bytes
SHA-256: cc5dd76423bdd8b4981e31cbfd89ed2762fa5498aef7bad353bb7f528e3268ff
font_01_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 10760 bytes
SHA-256: 9e6414370890b8b02b51211f39fc6792e03dc4fb684c8b2e3952a47f9a834e2a
font_02_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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