Malicious PDF — malware analysis report

Static analysis result for SHA-256 420a44a60cccef3d…

MALICIOUS

PDF

83.6 KB Created: 2021-10-11 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9470fa937972149c0abb0929d0e6f0cc SHA-1: 943a8c348ec5a5df20da6264589a1a575a4d4d44 SHA-256: 420a44a60cccef3d0912be89192b828965c0220c4f09ef89b02c82fb961e8eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites, many of which host further PDF files. This suggests the document is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=the+heat+of+combustion+of+solid+benzoic+acid+at+constant+volume PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebd651af---81547483809.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fofimuwukavi.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/21292317164.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/47119307077.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/vetud.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/gujizivakivasunakilezas.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/44905356027.pdfIn PDF document text
    • http://candientuvibra.com/images/file/486477868.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zalizuxepolawexadezire.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/93605608466.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/nabafapijisaw.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/mitotibegepexuve.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6ev1lb2bijh5qadjt207nn435/munaxufem.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/39707847667.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/m2tfvo3surfatne1m1rjlfihb6/32487094268.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/dutaxukalofuxisubebe.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fezav.pdfIn PDF document text
    • https://angkalaris.com/contents/files/benotenafikudaxavefujag.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/933236078.pdfIn PDF document text
    • http://volandovia.it/public/fileeditor/file/wezax.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/38675685997.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7ba803daf93f5e74220aaef6fca8fd6c/moxewimoturegawo.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/21878103626.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78256830927.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/72115546340.pdfIn PDF document text
    • 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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10972 bytes
SHA-256: b3b18b6a7e32adba52dee9efcc055a11695534055aea9bcb1450d7894911b2de
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 19324 bytes
SHA-256: 6d1b11e0bdc5160f1be201c2bc54d45883daf7308c2bfeaf08c7bbc47e275048

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