Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0c16ec2e38aa96…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 21:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb945146fcf5e6f48c90b8c5840ab872 SHA-1: 8c7890bd00513da8a9b4ffd22fbffd0191245718 SHA-256: ba0c16ec2e38aa9612234c7b7befb5513ee3e0c9895a139357ab98d46203df3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elite-nails.pl/Upload/file/zoputuler.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74828711d25489ab86a631f3c9f01f30/wuxemexoged.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lumoridupopinitigogu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/657ce199890e5c1db245eeaa17354ee6/ruwelibijimu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/namafenuloxi.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/tigarogidoram.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sarotedewu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d135f14d---85640708805.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312a83943bc---gabepakad.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tasejuvodurosivarev.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc81da24e---kapepezopinevar.pdfIn PDF document text
    • http://mamam.by/upload/File/file/39040271028.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/latifudaje.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/32730556189.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/bilabozaf.pdfIn PDF document text
    • http://telecycling.org/files/file/nabodokujemu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/givurevumexudaxagegil.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9f59e4596c6cc294e3ff0613e6f5be30/68319300474.pdfIn PDF document text
    • https://digireg.cz/upload/zudafuxododevoriro.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mivuzosogomeniv.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/30819114983.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/68478321215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=civilization+vi+apk+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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10320 bytes
SHA-256: 52df78862eda1ddc970b39b5447fe86cabc5de6196ad04e1f526631ac481622e
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 17700 bytes
SHA-256: c2eff660c5e4f8c0c88c0914c25510d30b5b26898084ca7bbf7670e5cf10d2c7

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