Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18dc79cfd423f0…

MALICIOUS

PDF

87.5 KB Created: 2021-08-09 11:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19673b8862cb794032b76e32dbc44313 SHA-1: 043b48e25dcb69f548dca43a166400d2e67b6cd3 SHA-256: 4c18dc79cfd423f0eac4a71ccfe994c398ad048b2b855b7d46a5465dcd08633b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f97bb0d7e---nodetojemosepijutifuwaja.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d1c5e8bd80e2eec33936035a414706a4/mopukuxixiwasofofimiburet.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1d0b7a178aac00cfe8dd755fee4eddef/77438220317.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/dunetiwasizimarar.pdfIn PDF document text
    • http://chromatographvials.com/d/files/rusirowa.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/84059149217.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5853dd15---godapotukirasomutokil.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5c56bb9a534e39da9d74c28c5a7ea20/netulevuru.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wodarej.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc6f8de68d6147bec8afe1bc789dcdc9/wumatonodituzin.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wusadadux.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d51fcf8a434---kedarovatavadeliwuferaluw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e926a0e31---92824842070.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b05220c7---63260827997.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/68591756854.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f008dd92c87---9716014310.pdfIn PDF document text
    • http://kco.su/userfiles/file/zanamevoxipi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7vi29gcv18isciu1b9olvubf64/zuramujubugudifut.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/24740378922.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/67953874912.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/senujoturoratidawojinox.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/37062540480.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44a16766b9---zevejujokisuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=activate+windows+10+pro+free+product+key+64+bitPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca2f4ef558---lapuku.pdfIn PDF document text
    • 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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17284 bytes
SHA-256: f3ed258a4e6c2b8fb3d1640f422343a4fe4e67b35c1f692bb1b11dc1da11e3ac
font_01_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 11564 bytes
SHA-256: 71e3311a6eb7203b6860e1ef972fc232e4812d2f27ea6c5187e7e1bcc636fb61

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