Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cb52fb0c92287d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-14 11:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 89aab9a57ee6e7a61570d7143d789bfc SHA-1: 057a2f200fa82575adfaab93a6695a0eaec5d124 SHA-256: 37cb52fb0c92287d4caec81a917c2a084e7d2f15f00be59df803401bc03dbee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of ML and ClamAV detections indicates malicious intent, likely to redirect users to malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/uplcv?utm_term=kaise+hua+mp3+song PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bneqfp85sammcgjkaa3m35lesa/73773886723.pdfIn PDF document text
    • https://activepymes.com/pub/file/52816926411.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/18711158897.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a29dead8c5f---tipowa.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/47088723426.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd81e3359---kanibagunivaxadavotumuwig.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/88426456738.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/bjjc0aam9u8662q8b9lv07eaql/96808154423.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2520b0c43456598462c10c4b961cab0c/veburo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ofa0436f9rnbucp2g99nkj886/lodaluni.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vlsrfij5f0sanp4pi3p9au2qo1/24590289291.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7e8293c8de855aa61426ed8efda18f16/morowu.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b60a34a080e44918ddc3668181076ea3/mufafoxobulow.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086299604dfd---jotufa.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/26a5616a2eaeb559fc1988621d88cd7e/rukivade.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839737bf0eb---belenemif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 5236 bytes
SHA-256: 1f6c64a80bfef21b546c7b78dc4efef9ca1f976225c145e8c6c271a71708be6c
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 2444 bytes
SHA-256: 16d194f72dfe8959282a1a1f30530b95d4dfb09311e33974706f90c363743adc
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11852 bytes
SHA-256: 8cb6e51b5589dc92215af5a79fcb0651be96b5ea99f4e4a6e6d73205eced3b32
font_03_sfnt_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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