Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24b50ed1deb7b2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7584e69b23dba658710592688c9dce9d SHA-1: 62a799c2b876bb620aeb042fd9a8508cbb31de72 SHA-256: ea24b50ed1deb7b29d67f7eceb61f5ba4edcd08629254287db751d1907262617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=how+to+download+thop+tv PDF link annotation
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/80274921530.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/61871747012.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/loniroge.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/70210910010.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/36680337867.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/5389407324.pdfIn PDF document text
    • https://siroyensao.com/upload/files/85967896742.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/70162427007.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/6605435994.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/xetivubinotoxe.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/49672408649.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/gagoxatanewizemobaba.pdfIn PDF document text
    • http://trieuduong.com/images/Download/49955828580.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6318b7830---vamodaxusepenasugi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd49c459e6---59485113952.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136046e97aaf---nesijege.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/97398321942.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40955818281.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/fujodanuwefijilowogax.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/turivegopileva.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/kiguxavuxifezapifatoru.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/34446798367.pdfIn PDF document text
    • https://insp.biz/img/file/redidufegorudatomafitag.pdfIn PDF document text
    • https://wrd13.com/force/file/23157859873.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/49461100919.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/rezaloge.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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10140 bytes
SHA-256: d7cde7d61d510582365364b6477c901913d878b7770570da56ffc43eaee464c2
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16636 bytes
SHA-256: 1547d2c5ae670fc9c2aa25c1c6a2a5c72ff3b57bb7b33191b87d869b4f0278bb
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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