Malicious PDF — malware analysis report

Static analysis result for SHA-256 db61b929e1bf5f08…

MALICIOUS

PDF

81.6 KB Created: 2021-08-27 14:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1a3760f9942d3ab94ec527de4688d78 SHA-1: db9d6452bcf631443dec17aa982cbde1f8d36444 SHA-256: db61b929e1bf5f08fd636aa984e532dbd6ac2e7db6b93a95435335118989a4da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards T1204.001 (User Execution: Malicious Link) and potentially T1059.007 (JavaScript) if embedded scripts were present and obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=who+made+underswap PDF link annotation
    • http://maiodi.com/userfiles/files/36799424733.pdfIn PDF document text
    • http://co-mit.com/uploads/files/33642336446.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c451537e---jisomatokozovikase.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6ecd655024c413c8bc7418870e48a935/78305278331.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625706196.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/16052685570.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/017319102dk9ukpt3bvcklvchj/94672141532.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/70134849232.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fapevuzijariv.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/bamejili.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/76283690916.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/vugasu.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/96686477a13ea1e519b4623c9fa74707/8927379336.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d39576245---kamadatezogapibewinew.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c3640efda6024e3ebd1c56de17cd9d7e/titujakizobipud.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865f16132d3---24499632731.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/46974494180.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xenudefofisekub.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c8420c6662e4eba96b95b93ada305960/polumeti.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mab7sd53pmahoib5c6q920dn40/tixax.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/wuzerexojajodorosodedugis.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2534988c1f2c8a39fbabdfcfc4af911c/82959070740.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/75046371271.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/67861585847.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 18084 bytes
SHA-256: 057f86d57b8d634a19103460a84041f9d6da48c528a60d335435b9361e8c1382
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 10600 bytes
SHA-256: eedf903cbd71fcc23b1b2c35c810c94c29b59e976526ee2ac79aadce8e4eb36b