Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbef3ea0fb53dc2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 21:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 766671886a410891e83837a71a17eddf SHA-1: f78296f5f076b55053409ebd7c83feb38228c387 SHA-256: 8dbef3ea0fb53dc2e8b0cea2e83a12549e7514b78eed8cfd676162858d93329b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gelateriacool.it/userfiles/files/vadebubur.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/08511338dd63de3481c77d4dc87e4ab9/robivog.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210901062601.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tibikeresijolurajo.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/61657037782.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/31003405137.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5dd36b88---42117850915.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/4523904023.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/12556080943.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89748879406.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161349dfc625b4---16096184938.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/27496363710.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/15316967829.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/98423532215.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/bidinu.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/10655445838.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/18538819120.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/ximowazasezo.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/25867330412.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/19788133138.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66048602113.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/21391988639.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/53481849441.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7cc58cc4---27130072259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=increase+touchscreen+sensitivity+androidPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 18120 bytes
SHA-256: f3f9435e629401ef1df8cdb7045651c0be3e4b435866d98b7ce8fc8e8cb94c14
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 10652 bytes
SHA-256: 8d03ea39d2cb7ab9f9363829e96a0ca34484d8c57559003974a7e50a7f51c31a
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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