Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ca6141750f7b5e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 18:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db59c6e07c2b60982e092f748d3e5fbb SHA-1: 7ba2026874b67abdf0eb2da0b2e10e182ebc28f1 SHA-256: 51ca6141750f7b5ed0adb8b225cf2cf12138c37329a15ce0617005f62141ee46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://coretry.ru/uplcv?utm_term=mhada+lottery+mumbai+2019+advertisement+pdf
    • https://holcom-solar.com/webroot/img/files/piwuxolopamefulusarenale.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/eida5k0n76bed7u5oe536nrpg4/kason.pdf
    • https://zoldlepes.hu/userfiles/file/33501648342.pdf
    • http://lednotice.com/userData/board/file/weserexuze.pdf
    • http://anoh.net/pds/userfiles/files/78538273857.pdf
    • http://thietbiotovn.com/Images_upload/files/83230425849.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/66676793376.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5cf7c8074e88c34c4f47b08dcb7b4bca/5384027983.pdf
    • http://daegyung.kr/userfiles/file/20210710104951.pdf
    • http://eichler-kammerer.de/27536270702.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d082c6c321b1ffd21fa53fd25a2424dc/dawupalufetasetomiki.pdf
    • http://myphamhelios.vn/luutru/files/wepemesefirebag.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubf9h188o5mochfmc17md6l9d1/kosuzavirebasexi.pdf
    • http://dieta-plus.pl/userfiles/file/ravona.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wetiduvo.pdf
    • http://ndt-tl.ru/upload/file/24823176751.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fed6f969---72465923002.pdf
    • http://doanekeyes.com/userfiles/docs/nugeweru.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/22907584136.pdf
    • http://hugslock.com/app/webroot/img/files/78904451649.pdf
    • http://ainut.fi/userfiles/file/71343056224.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/kisalazeradidasijavem.pdf
    • https://bleikss.com/userfiles/file/93724100582.pdf
    • http://aqs-group.it/userfiles/files/62390998481.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/867b56e5f466b7a1e2781ae063487506/90634271281.pdf
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/zoxipafasu.pdf
    • http://888spirits.com/userfiles/file/biwuva.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_off0000bef3.bin
30232c9ca8e2dfd6f06f83deaaa2c5b3054925418430a9338facdf0871f8664c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 11636 bytes
font_01_sfnt_off0000da43.bin
916ce0609997d2e6f61c1a8d976803e34eb0fc5655f31b84544b88ccbdd051e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16468 bytes
font_02_sfnt_off00010485.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16792 bytes