Malicious PDF — malware analysis report

Static analysis result for SHA-256 74260452a9cdeecd…

MALICIOUS

PDF

97.0 KB Created: 2021-08-04 02:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42c7fcd60cd301818065a0ce349f518a SHA-1: a640c2237391a7b7349e00d03dfb947ca697cea7 SHA-256: 74260452a9cdeecdbbf791219ba3f72fd38daf9bfc959d87a0fab8b53aa81ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=what+is+the+meaning+of+interpretive+framework PDF link annotation
    • http://asea-admin.com/_userfiles/file/20210611095432.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1bf3813fe7791a1a9421d561870b6ab7/dozumusevawofodemevexog.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87bd9bfe0---lisixusaniborepe.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/40559659188.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c49c7994---naxinufofisex.pdfIn PDF document text
    • http://fygl.net/uploads/file/192235521488.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb5471a0---basosiriz.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a2112b3da2432434989d55aa9c5755f9/dafunubipekup.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/42990371150.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/rulatudejuxinew.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/56938915203.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e9ba1b0df25cd68b0cc7d6f43f9148bc/debomabeforenopumol.pdfIn PDF document text
    • https://ewt.cz/res/file/rapewod.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/wujanatezazivunixabebi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/25532316001.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/408a6e811d131bc86722c2c94792d0f4/wosoziviserivozodarov.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tisudaxotu.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/6859787820.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103cac6a191c---vajonubonu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098840d90cb8---dutigejomez.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b072dc3cccd---mekidakusagaxenidixevir.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ec25fb949ad18e400ee4b0426bc6a60b/nojozinesozitesowuje.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/841ab091718e72376f2f4bf218536140/66458851585.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_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16600 bytes
SHA-256: 9daae6ed40e3dc621d98de4c2d5db9e2f8eb5d62543d52de8e1b7ca2353fb336
font_01_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B47 10996 bytes
SHA-256: d9b26749fdb1c76c80ec6340f235ff937db15d8e8f0907e0de50530bab29428e

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