Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec51b3cd8bf27b60…

MALICIOUS

PDF

107.4 KB Created: 2021-06-10 22:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7d39850d80de0aadaf2c77e55faea9d SHA-1: 6eb8b941c459337dc0816ce9bb8f0ae92791b43c SHA-256: ec51b3cd8bf27b60607bbf5c97c13a65be2d1489815c81c77ebaed2e6e6abea2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://garglob.ru/uplcv?utm_term=the+interesting+narrative+of+the+life+of+olaudah+equiano+questions PDF link annotation
    • http://www.toptehnik.si/images/ludetala.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/29340102606.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160719755ab7f6---dadexanaja.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ab9c651de94bfb7d12c3eaf2673d82dd/65606808637.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/37212579411.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d76de8d7---71101116253.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/julutijutopete.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/648e6daec4d558c5e1ace7746e938cb6/latuxukifatedowu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pkm8pjd4382qubm01uoutb23b2/kazufesederijipudumok.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbcbd73ff---6938817508.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/121885b777cf1bdb18e0ede6de3e92b0/nikavusijimowaka.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vb9ntefkb74tufkb3i8t2nomln/29212613591.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdac7a77d9---65553862374.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099f48fc4a06---juwovu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608150ea0a680---50912592428.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/6655294347.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5dbe5cc40---napax.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/9486449068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B0 5184 bytes
SHA-256: 98c1e1deb73a15fac6c8584b6f36646e4270c95adfe694396d8535c907f08f29
font_01_sfnt_off00016b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B47 10716 bytes
SHA-256: 14822f4c38eb7e186c20da4a8ffeceec664143da47296e1c7325741d9a56e73d
font_02_sfnt_off00018faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FAA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361