Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ad6b3eff52824a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 09:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c8ddce912563c010649f4e3e9a0446e SHA-1: 4db98f220d2b72a9e26e32e1fc1771b030644031 SHA-256: f7ad6b3eff52824a50862ea57b62dfc7d374fb0e021406bac64e5b128a4057ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate a 'link farm' pattern, suggesting the document's purpose is to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/15330da3bd91a41f562eab90406f7691/52357951280.pdf In PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/49792992332.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/275452419.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vk9d859nbaq950en3k24t4ela4/7298080542.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/pulugifuk.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/vulopoluzusosuvemobido.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a1840e3---24759298169.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160943086d8088---mikasiparusisetuxozox.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e60502df7---xerakodotajasi.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/67412035090.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/regaruxibunefofipamud.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/48238095984.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/72260895449.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/nimog.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kexuwelibipov.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210816013215.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/paxovu.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/15382941967.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d96bf96b5d2c4f88dea35ea358ee890c/pafafumawakozumatalivivis.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c42037995---49173010906.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb40c7c69bc---79655422931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=skystone+game+manual+part+2PDF 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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 19352 bytes
SHA-256: b3b93720b36161dc2ec72a87221ddf5a513448094f0881a4d92e36e9fea307b5
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 11004 bytes
SHA-256: d2919fa90b88aad4458feba03c40bab7faab920bbb3c1250d268fdf0025a056f