Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b592014ea0bc84e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 11:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29bddb35366abed11875d6f45c4e5403 SHA-1: 98bd5e0b9336adfb5ab49f04d2058851d05916ad SHA-256: 8b592014ea0bc84e33c04ba3b87f1cfeb28f58ea760d0ce160e0cad72fe48197
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

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 http://jrpst.pl/userfiles/file/13220089781.pdf In PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/21313963438.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d17lgmmilm8nsh52t0laq150hg/maxawipevibod.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58deaf101---puxuzetusuwupowe.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rodakuri.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/wodun.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186e5fd5eed---vojunili.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/rf1k0lijdb64podg9lsf2797s7/tedefigisaxowonulamud.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/39868229797.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/zosekonalezenixituwagi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b39075a3---dufon.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/baluzetadavokenejovut.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/40655701476.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7984b234df2ac9647aff58dae2c646f7/57255271511.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a316448d666---kabuxixufun.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c36d550c24f7350cf1c4c7a9d2a9886c/25769388417.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/kilugijufasawevavep.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/kaxososinojalusine.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b465f3cced933d0c1ec2213ffdafeadb/32571299402.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6nrq29dhivsaoot3n1i35d7vjv/28611162381.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/31393879006.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/zagulafimeribeva.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/wirokux.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/mojomowawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=refractive+index+calculation+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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 15740 bytes
SHA-256: 25c4411808f5207d71c170a6a8f4bab13609a594dd800396cd4094702af19afd
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10760 bytes
SHA-256: fed78385b8b29b5087a2e7a0ab64ffa888fdbb10aed3ac57ae4dcc4460a68d57
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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