Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51921c136b9dd67…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 13:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 530bcc83ebd228eb8b042009c8981f6b SHA-1: 9f6681f2518a2c9b02aa165a966ad7507048e67f SHA-256: c51921c136b9dd67722fcc201715dcda5b8404ac4d97f0d70708a9358d324fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external malicious content.

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://qhchemicalsfeed.com/upload/files/54292839892.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadawokorufebax.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/pejugefuxigeninonini.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/tifopozexozukavofow.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8pk11qt99oo8p69b8bld5hbvk4/20023373790.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/danizoxekerot.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/ronomaxakirel.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/50677986412.pdfIn PDF document text
    • https://eklyps.net/images/file/84652632497.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/vibesijuwafama.pdfIn PDF document text
    • http://hiniceshine.com/upload/41646092.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/89931461268.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/67412281606.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/37517311719.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/figumasavuboz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043f0bf028---96333953381.pdfIn PDF document text
    • http://hk-keber.de/images/file/xexogagazawanute.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/505d65587e9c4be38527a823224ee45e/77697652263.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bawurijejuwoxuzaperol.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d4f67e15---34273820703.pdfIn PDF document text
    • https://kueapem.com/contents/files/wafawezibowatug.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/muwefetizofotivewa.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7c5de4794948f53dc5c8d4212c31046b/jolibajuresijiwumofoki.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+small+group+communication+pdfPDF 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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 16064 bytes
SHA-256: 40da06322daaa3bb62b1eae6a62127da6ed923a923c53296a8c58897291c0eaa
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 11012 bytes
SHA-256: 372b075b1d43c203a67dfa833c19b6c73d1537f8eddaa9e495c662a6f2f26af6
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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