Malicious PDF — malware analysis report

Static analysis result for SHA-256 4052b07874c52462…

MALICIOUS

PDF

111.2 KB Created: 2021-07-29 23:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3284dcccfeea02e34941e3ea2e4f22e7 SHA-1: 768c8bdf2ddcf0643367d8bfbd5e1a37fbe810f0 SHA-256: 4052b07874c52462811a2aa9dabf5a6a2f09a47a6ce1c9c85457cc82f6feb951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to a variety of external URLs, many hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=donald+duck+comics PDF link annotation
    • https://capecoralliving.com/media/file/6338496313.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/xufifuwuda.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee845a8718---vomisupigupirikitemo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/rutebad.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ab1dfbfaffcb7f1cd0be12fdfd8baec8/93429325007.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b436aa530---powufepato.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tukogetemogupalufuxa.pdfIn PDF document text
    • https://soechi.com/userfiles/file/rulivu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee9245507eb---pejefidikisigi.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/90307206581.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kukematifasovago.pdfIn PDF document text
    • http://sam-global.info/files/file/85096174627.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca357b41c5---53805037062.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/12801594746.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tofagixixasegubimolofif.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e653011ffa---wudewaxenedepuvita.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/4613689757.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/beeb583ac515318b7b60de19eeeb617c/41104794309.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/17269589717.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/44354529822.pdfIn PDF document text
    • http://stl-hk.net/userfiles/woparozelusaf.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5ca13f8840206b8e812600c67075196f/48187511999.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0be896b412a29bcec4cfa834d03e81f0/xewuxujawup.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607686c0b9354---7165880883.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e132ac57c357c9497af8dd85ad3e888a/45964111054.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14190 10396 bytes
SHA-256: 3da0604f984e1f3386cd787ee0c5db46a8c586868fb0264b09b9e724507b4aec
font_02_sfnt_off000158fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FA 18072 bytes
SHA-256: ae0f2474f9732510c84a4f3068fdc10e0ee099c55a79b0d0c9864e3c27c4ae8a
font_03_sfnt_off00017554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17554 23732 bytes
SHA-256: ede3acecda2a007bf38e47915ef485444c68087820ef3bf552704f6904b9635d

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