Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae893a4b5bf4d583…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91ed0f1d737664ab253cbcd0d9bc5673 SHA-1: 3f18ef880a1b064be3aa1ba01912ef30459cf4d3 SHA-256: ae893a4b5bf4d5834f6e3802d5ffa32261509c178133be0426a47dab937caa93
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of 'PDF link farm points to compromised-WordPress upload storage' heuristic further supports the malicious nature and potential for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kangshi-you.com/uploads/files/202109062237084337.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81946953443.pdfIn PDF document text
    • https://clickbox.ro/images/file/zuwitiduvipanaf.pdfIn PDF document text
    • https://msiutilities.net/documents/nanodiwugetosag.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161312364a3d16---78642890605.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/62978820030.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/rizikefatubu.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/60274065532.pdfIn PDF document text
    • http://briztravel.com/upload/files/rabuvafavulomiko.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/jurerit.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77946532160.pdfIn PDF document text
    • https://dalba.net/other_files/File/nikojelefazexinadosu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/38022166942.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vi5qlp5eco7et7m5i5jeo70dm1/94732519413.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161365a8a23ff5---72734913069.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/45593598078.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/kobejifojeb.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/32367077350.pdfIn PDF document text
    • https://turbooto.vn/upload/files/ruzufinufutojisizumitud.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e518b2f1---59776054371.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/58137863138.pdfIn PDF document text
    • https://satesayap.com/contents/files/gupojazozexet.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/lavedokola.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff7cc9fa49a610a2d850688fa5eb0086/kunuwugon.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fetutan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=live+wallpaper+in+miui+12PDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10408 bytes
SHA-256: 050ed55bb7cb5a98fd8cf937b723a88912f5c1813b0052e019a5e39e7a5deedc
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 17904 bytes
SHA-256: 71f27c39cf0aaa032382a5b3bb2710c63d5392d16f6834823d6418aa043a88e3
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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