Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dd83be74a1dfc3…

MALICIOUS

PDF

81.7 KB Created: 2021-08-02 23:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af4c566cd3b9b6120ae410c1f1a31e02 SHA-1: 0c0b9a5352860bfde7aa4d22953950ce7ae45d23 SHA-256: 74dd83be74a1dfc391831298dad20ee468aef432d6b7b8bea480eef41c0aee30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86beff370b---xopifegu.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/75385125612.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/stoh0t5so2atid5q93phfvtc6v/dosubiwenotigumelekege.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/botetutagemekekasijopego.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d8010dc6---pavijexewola.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4a7db5569e01d629e3d32369f80c2171/jodipajokezot.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/24848849783.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c367102bb1dccdcf77edbeacce482f1c/rebujikezag.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d617ee3a84---tegugujesivilus.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/36548992393.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/29500352453.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a396aaccf0b---44623556321.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c649d9f7---dufaresutumopura.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/84050181080.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160950847920b6---73539518858.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e74cd2ca4---51423152132.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/40505292334.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070622045580554.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/38hvro1c1tj8ubkjefheibpmbb/morepabexowotufufawunopel.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80d361faf---65388681457.pdfIn PDF document text
    • http://yuha.be/_files/file/88542386516.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/penukodojaxasetagivop.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mijemejazufilesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=my+community+worksheets+for+kindergartenPDF 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16508 bytes
SHA-256: b45a1b217ef8948ed545a9af2fe3bf8e2b768cf94a0c32d4081d1d7787b76094
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 11260 bytes
SHA-256: 7381c75a273632b2a42540ef029fe0c3c3c5112d9722cffc28362d216e7b9803

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