Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b1463ee84cf418…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55cf72e6a2d4204c01a67bf9faf3d906 SHA-1: c92868944ca7248f1efc9e0b4c04d64ab673d686 SHA-256: c0b1463ee84cf4189316947fe59800e5b538ddd2780c0dbb4b19e0af730e7311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress upload storage, with numerous links pointing to potentially malicious or phishing content. The primary IOC is the URL associated with the compromised WordPress site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161129fb9dab28---parofexokipifusur.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/33939400733.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/66775441616.pdfIn PDF document text
    • http://rayanchem.com/d/files/33636163559.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/466c57dbeca7a94fcc78cddade2ee158/43397334607.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7ba1581268172fac293696010504d859/92982741469.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/tebotin.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/9496654302.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/zebefibiruka.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/logete.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/49000118942.pdfIn PDF document text
    • https://ienter.bg/files/fasanubapomubexabeg.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116ea911859f---bidek.pdfIn PDF document text
    • http://vizcsap.hu/files/file/64556055726.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zezederarizener.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/binezijudi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bde7882c59cff73ed6a5f7018f4ee726/zunujob.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/20874348950.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jadalojopakud.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/tupumavirovatani.pdfIn PDF document text
    • http://com123.vn/uploads/file/27923609788.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b9407fe1---juxetajinonatabopam.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/sasijaverotikidakuxididag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdfbox+xmp+metadata+examplePDF 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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10440 bytes
SHA-256: f1c38ff1120cb25b84a5335d087bbc2e5082cbdf92ca427dc8cd0ae0a26d4ce1
font_02_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 17964 bytes
SHA-256: a926d71502b4f6eb91b9f661a425e55fa83ed3d7eb4b2c8a51abc2338b3c1d18

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