Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e3d775cb4644d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 13:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00ece56da73054fbab10f95fcf7959f7 SHA-1: 2b931939aa3ef3351bf8d3207a9e9e252a8c583c SHA-256: 421e3d775cb4644d95b42daea6d2c8dd7cdcad1a5657d360911af0c559933c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614161dabdd3e---fevifajifaz.pdf In PDF document text
    • http://matras-devison.ru/upload/file/87999748879.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/95950870529.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50163671965.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fudubonedolu.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/sulegipukerudofuvilufoxip.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/55391338010.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/90380298747.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/wosapipijamusawijuvujun.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/livinos.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090919263080.pdfIn PDF document text
    • http://htygroup.com/upload/files/rozekitonoda.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/sofijidavizaribigorijiwo.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///16933365459.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/99318489115.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/78821113313.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/58k4g1nm0befthio024nvbsrq7/kugugesejitadujixamefuvut.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/85383166501.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/tibokivu.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/zukufovivipuposozefamo.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/sonitarumapenusa.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/50308059253.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/60656527598.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a375551890---luvekesuxiruzelegux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=oldboy+2003+free+onlinePDF link annotation
    • 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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 10612 bytes
SHA-256: f215f9878e83057ec4ed7714c7c561ebb46179b67ae296ab1e6444d7942788a3
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 17272 bytes
SHA-256: 13735c08aa4c85e8413d4834d8d5de129a8b70b27aaf71b589c0ccd8c5d8f361