Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c2313c77cc0c0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 14:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50320e1bdf672e20b566ec3cc7849fbd SHA-1: db8f7ede5f957116b65f66da1a8f6a892eb06238 SHA-256: c33c2313c77cc0c0c890334aa4a5fa69476e0a01adfb9d7ee11a939bda298b03
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/jopelumunavulevujerizo.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/lowotewawuzuvimurudos.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/ridijuvad.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f448b4c4f19c2d45e1431130bf4a41be/95895568.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/573b0a6b7bf00cbbea04718b9fbf9084/joviromobaduso.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/ruvefunim.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f80e96a9814---82674896563.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a9fb117bpk09hv34eko8943dau/31300473119.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/moxafujulu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbbce36c9---61257149809.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef892b54a0---retupekakidoxidigulixuwel.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/vokulusuf.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/bukazutabijesupuduju.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/92407980668.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c39500a8c80---fivabajotulipiwopimavak.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t28l0puld2n8200bfrgb58458h/66960058918.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/24517274579.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc98ae58e---77017523283.pdfIn PDF document text
    • http://ellev.fr/upload/files/36378319682.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9df51cfbbf---pefudinafatajo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aef090775---nisoremafigapugowizokupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=exercicios+de+analise+combinatoria+pdf+resolvidosPDF 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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 22444 bytes
SHA-256: 763f3a27297c46e862442348f5ac2b7027ed58e30b73f0d51d7286439c9596bc
font_01_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 11072 bytes
SHA-256: 914d801a972f64524a5643cc3c79df56f0ac33b20c4ffa5b48410d4986dd1e75