Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d543bf325b16e22…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 10:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50551780729df2d92ffa78f56ec0b06c SHA-1: 1cab1ab9ecdcb1083cec5d99d0cb8c1f8a2cd56a SHA-256: 6d543bf325b16e225d1409e2a762a1d9d1528a0f23c9510d553ade62daeffd5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a malicious document.

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 http://cnc-soustruzeni.cz/files/file/rewidivonuzonadevupumin.pdf In PDF document text
    • https://addsfly.com/userfiles/file/vaxazam.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8837f1d4---fadaronuzowapinamovalaxox.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/vitanafenavalaxasapovof.pdfIn PDF document text
    • https://actor-conseil.com/files/file/soxoxekajuvavabet.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/zanitusas.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b520b15e---63413129598.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/zesadesesi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075942907fef---sexevefagivivovus.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/dijimu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add98feacb7---fadefa.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bf05e70a368d4f71ea0783316d66b661/45036808646.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501220551466841361.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/vunixalaxanedufek.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/wabadodij.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/96806735055.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/96395966624.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c225e554---26346455781.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e2b44cb9fbf5a478727d24d838d18cb3/xewakawunojonijarijunok.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07485bdfd---dalukagasikefigegar.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/eafdd523b27844193de9a1edfb89cc24/93555759601.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vomedofataxoriz.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/rawija.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619171414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+read+ishihara+platesPDF 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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10460 bytes
SHA-256: 46b7e9ae8296a0ded14fc53dc21c5785a269ab1be8c8955f316fbedd36d0dd64
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 17304 bytes
SHA-256: f3d41a13f1a9e3e16dab995bc5254d3b6ea8d13933d598ef5e086a6d7dc477e1
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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