Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a904456165d5a87…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 07:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a235f96e52236ad5789466c0c7fefe55 SHA-1: 486e9a7b351bb817b2850efad2933916f7663d53 SHA-256: 5a904456165d5a87288df87bbb40b75c1a8de4440c5f34d64558725bba631670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. 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 document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://hnc2.com/userfiles/file/9118687995.pdf In PDF document text
    • http://www.moyekolodin.com/files/86554778599.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/zipifa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7om8n2fliidqmfqags0dufkh3k/45772986566.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a0ivsbh25ojui4a7ut49fbth27/tisusenunagekejavedinoput.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/eef6b1b7eea824dfeaaaf7736c023c5e/kadeko.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/36365767629.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44832049349.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20954070976.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/polaja.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/bozefugotofobixopob.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/81705322143.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/3321822997.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wagatewuzozu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sabaj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/finagenapogitosofono.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981151e9bc9---toxibosopukezukobojigutu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/setujidenat.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/j671a0dldgb0v1fbnt7941v42c/59737520581.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/zokinemur.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba665981ff---19128512057.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/86c190ed29b496790b34d0bafd6f0a52/tivoxogufisivaxuxa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ea12a8043---kalepivevegupogagav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+pop+culture+trivia+questions+and+answersPDF 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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10880 bytes
SHA-256: edc7a1345da697af5070dcf4b2b9ac778c78f4e55a6e9d07d0503338051759f4
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 18560 bytes
SHA-256: 97d0ae6930bf6a33f5f94ff4e06c862fba956b15e2090394dc00829bf6973d56
font_02_sfnt_off000141dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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