Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cd9f7ce233500b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 15:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78246fb515ec7cf52518e9e4bdbe9fc1 SHA-1: 935d653e786f2730f205bf7ae4e460434bd8b54a SHA-256: 00cd9f7ce233500b24b05782db4b91ab8909576901a75c4c1723653b636637bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=oceanhorn+2+free+download+ios PDF link annotation
    • http://paulgraphics.paulsfashion.in/files/bikudonorevim.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/dexufilezirelifafuxa.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/setepesevu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9912a8b4---wofuvivisido.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613eccfa1c52e---rexegajixawuj.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/midubepetugatirulidugimi.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/45094218656.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/sazijep.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/dujutipuvotopilonava.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/bifitimuvagiraga.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/76216958387.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jfv28t58p9gvj5513mklqve995/83456994208.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/55327282660.pdfIn PDF document text
    • http://praguetransfer.com/files/file/22756204580.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/bogitibasupugetesu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/26397320390.pdfIn PDF document text
    • http://falerisztika.hu/tmp/38416346283.pdfIn PDF document text
    • https://songhong.info/userfiles/file/68106730648.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/mefugokibol.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/39448879558.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/tuzipejuwebotib.pdfIn PDF document text
    • http://arucax.am/user_images/file/68951626131.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/12271427628.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48641642542.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 10704 bytes
SHA-256: 3a80811e3a1bf221cf46eb3836b6c3245125b689a9b794f3661ad5bb2ba2073e
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 17596 bytes
SHA-256: 4ae45c3e88604b74c6707a9a16889109297440e8d4d8b41e1b6a4b9b8be15157