Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfcc40cbcac230b…

MALICIOUS

PDF

161.0 KB Created: 2021-08-01 13:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c038ffda9de3f6f2547df51824df2a77 SHA-1: 103c67a204859ec3d15bc7d6d9a93c7b4fe4c0eb SHA-256: 6bfcc40cbcac230bd971c4b704397a5dd226f1a6459d5e18489eb0bde24a0b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://banquat.com/userfiles/files/rudamuvawotakuzup.pdf In PDF document text
    • http://sclifeguards.com/clients/16854/File/dejoxeriwadinak.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n4npl14vip1qmia30ph4vijdhh/18128179540.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kivedafava.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/xuwotumituwak.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160916a5445e1f---lisovaw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/89923728890.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kuxor.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/ruzaleparijasizudazorijod.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503222903702453.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/47808913953.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0268a3ff---duwisabezudumegudupabe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/xomodukaxazogu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debb50d6de---sowimiguruziboputajex.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/48735885820.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762dcb86afe---42719865815.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/59157226584.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083a61ee2dec---12665192999.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/xewotolevepopekijuganixe.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/zunuxupasizuwuko.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kukozavejafe.pdfIn PDF document text
    • https://cartolmania.it/file/voxuzunel.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/84248859073.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/6497009950.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473253c9e---44804193825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=itiro+iida+ergonomia+projeto+e+produ%C3%A7%C3%A3o+pdf+downloadPDF 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_off000208e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208E5 22932 bytes
SHA-256: 45dd13a0fab48759982936a328fd40d3ea6434b9e01f566531362f9c1994f6cf
font_01_sfnt_off000240e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000258fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258FA 11404 bytes
SHA-256: ea6ce1d02f9acdb624c2e0a60f69398d4931c59bd4df0a50c2baf18e08bff32b