Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5b09fc66dd529e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 21:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97ea0713ae7fa07599f47afb329a716c SHA-1: b7f84d86d00f6d7e8dd42f2620c450807cfefc13 SHA-256: 9f5b09fc66dd529ebddeeaddb77b7dbe9f76b914bf2374bd24e4a7ab4ed9edfe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful 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 https://medvor.ru/uplcv?utm_term=culture+of+fungi+pdf PDF link annotation
    • http://hangquangauto.com/files/tozodulupupa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/novoxasitiv.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/12690683370.pdfIn PDF document text
    • http://ned.ru/uploads/files/xodefijeresubozif.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cecd0b60b4d585ca2a47212fe252621/28263700938.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/74108639318.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/pabeluwisutatovuga.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c4be0bd4bc215a2220062e888d30d7f7/21982432072.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/9601630807.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210801012158.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8abfd6f96e3f5c3da8ba8185f0c13a3f/7592201715.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/65786882469.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/letikabolilebedegate.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ece654807---37692278379.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/femojubokiwi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbed021b2---vumixosefotilop.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52484139753.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vv91ifu7kbjo5viqd2q63s5oo6/69606434508.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/90546842213.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9f61e3623158d54365ec1f4c86457e18/kutedinepapemutagopujuso.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1dd85cdf---81093824088.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e6af943890047747d17707696ec67c4f/tujuvuromigajugizuxiv.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/10078006280.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e3d70658e8a9698433b8d8ba342010f8/36315388074.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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10472 bytes
SHA-256: 2c063c1ca829f639c20382b7edcd651fdca95c85554f48f31031af2175de2989
font_02_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 18216 bytes
SHA-256: 3b01f77c8e714bbe1c6e8dc894afb0e634f74d98a3a044810b97839bcb9fd54d

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