Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb932fc65bfc0fa8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 09:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c83b9a7c9a2f216703b71e022282081 SHA-1: f1f354756d0759636cb1e9a4bf129c409179341b SHA-256: cb932fc65bfc0fa88317f63d1bf34905178ad1753835e6c9543f1d4fd63c63a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PRC/3D content is unusual for a typical document and may be used to exploit vulnerabilities or obfuscate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://jjsgreatescape.com/uploaded_files/userfiles/files/wiwogomagiveribekekom.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5abe1447c---72342671626.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/86861952276.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608455abc2baf---xikofitus.pdfIn PDF document text
    • https://sergiomauri.com/images/file/buxuvuvikobi.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/77902199093.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78768884712.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0q66nqsb9nr3g10ottco11ufeh/28834452161.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/majeb.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5e65472477907990950fc31c3e981fc7/todetedavazatojatomafepad.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/kumaludokadup.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/47558107635.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/24428687544.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/41561556269.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6f7336e27d9b466150dd596687fb77b6/89577336038.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91056847330.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/wutupilegodupeguxod.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mikotuvemul.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/37869359699.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ug7ec87idg04e60inl5ib7ma3/35602087854.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/idpov7fha9vh0gc53unnhadcpe/bedolewew.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/62960732567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=honda+shine+spare+parts+price+list+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_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 18716 bytes
SHA-256: c7eb281ff4576a21439af821730172d82bdb8fc551ab59d8bf2ea534d2cac816
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 10708 bytes
SHA-256: fdf1d80a00ee125f9b335fc1a3629c2e82b44cea94c8e4fd9ba0a80501bfdfbb