Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5b8fc794d596da…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 06:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 222d12ca172c1085a678544ad3f31c82 SHA-1: bb2bb3db1e9ad0f3afc4aab0b4fbc47a456456e6 SHA-256: 7e5b8fc794d596da8022f99c033f955e5cd7d58fc5a274201e85979672adf004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous suspicious URLs hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the malicious destinations behind seemingly legitimate or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=android+init+process
    • http://zit-tech.com/userfiles/files/27495629836.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ecc0b275---68451061599.pdf
    • https://creativitagh.com/pevron/www/img/file/kezunanu.pdf
    • http://aorganboys.handyfriendship.com/upload/files/7619444256.pdf
    • http://resumesfromabove.com/userfiles/file/64857096051.pdf
    • https://riolisboa.com/images/ul_files/file/JBSVds4anrf5.pdf
    • http://studioego.cz/userfiles/file/16458710830.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161326e71284ae---72357018304.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/14267189879.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92186643700.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210903090508.pdf
    • https://megalightgroup.lv/uploads/files/81404399629.pdf
    • http://orderkai.com/uploads/files/luvumiwagunuwelod.pdf
    • http://www.ap-arte.ro/fckupload/file/69984368352.pdf
    • http://melly-incendie.fr/img_db/zojubawe.pdf
    • http://yuli-china.ru/d/files/gemededamelumidek.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/nadedivasalur.pdf
    • https://playindiano1.in/ckfinder/userfiles/files/522709998.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210912_9B128FB4A603E1C5.pdf
    • http://liebherr-tr.com/userfiles/file/43599921377.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/id2f3s0shl90eisqppoel8tev0/2776356791.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.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_off0000b18a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 16792 bytes
font_01_sfnt_off0000c9a1.bin
c735fb6ce9c46a37b204cd51d0a08675317469d83e20019149931f43cdb8dae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 10280 bytes
font_02_sfnt_off0000e0dd.bin
f07faaf309151d4a869b347cc92840b5b2dabad70c0cff144d4cbcb654904c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 17200 bytes

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