Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d9ff9e44c21e2e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d7b68a518c3c9546fc30a3a4a0494ab SHA-1: 210ff37d0657232a0f0119bbb959df90f0fb1024 SHA-256: 33d9ff9e44c21e2ec60c2786109ce30b1fafb3b3ae67c741ece1efb85e455a65
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://uhy-th.com/image/upload/files/78690547436.pdf In PDF document text
    • https://dm288.rs/slicice/file/widinokegid.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85795155078.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/31419085864.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609e623c9ae32---kosezujuzokobadikoraniwe.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/37178516072.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/93joh302qqgudtp2tptgfaoe35/zemutumisanekizaworaj.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/tasujidujibuma.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/46758208832.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/75a164bca9be91ed686c51e888f46cbb/86892128961.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/fosiwanirulabuxotanawod.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/9140396538.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/23afaef55a53294f85663c126405eea6/lapenutesokakulo.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/denujezedurujamufejuwofod.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/38928785120.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/joxuvi.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/majenakilebodure.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/14238766363.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/87958820936.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b4aca2e940445b2f297e8b9b95ea8da/51706076594.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28684736505.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc220c1c9ef---27898726976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=muay+thai+workout+routine+pdfPDF 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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10768 bytes
SHA-256: 8c60dc9deeda13fd7ad87966c3c1f51a34a6c2d3b02d78f345b4eedb67fc13f7
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 18216 bytes
SHA-256: 1573fec5a0da68f8f1dd89aaf8f2b45834dfd3a475126708e4f05678716a221b

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