Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb30d2516ace7bc…

MALICIOUS

PDF

98.0 KB Created: 2021-07-03 07:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14b987c61aeddcead52551f2fc0be813 SHA-1: 7d8ae4339cfcbe3546f0398412d457c116d0d047 SHA-256: fbb30d2516ace7bc822e7a59e2b7c63279c107b755de2b39e39b2054d563d566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous links point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=athlean+x+perfect+chest+workout PDF link annotation
    • https://dolcezzecaffe.it/file/baminudivixofoxuxetus.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/zilixoledinezuwumasuxubir.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/15af0175c04dd8ecacd822f01ded4e45/rowusowetegiroligi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/26089241561.pdfIn PDF document text
    • http://cjatkinson.com/userimages/momovin.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4f4979276---71941809037.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/94396668805.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/sozekitoxadu.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/4719214929.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2250c8dff1e840bc250baed560f5855d/89592723525.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a17a7035198a5a55ade766ba779c8669/76462585224.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/cnaepicd6a9d09i9a499ukmq3k/nizuniwositisowa.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e7990be1---folifuxedenosibatikamoga.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b17a6b523---30979402474.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee90d206ce---70978858873.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6bc13e12bba10760e3b53ebb9d4506f0/zedir.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f179dc08---vozexonisetisu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/95800124965.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sobeziratev.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/gevuruxarevefuf.pdfIn PDF document text
    • http://matras-devison.com/upload/file/65629881230.pdfIn PDF document text
    • http://shosholoza.de/file/betukojamoporafefaruj.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094396b48e13---zateniloxoranoko.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3651cab9a13e5f59fad11c9ff05f1b5b/11606344784.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/feretafuxuvufalefada.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_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 16324 bytes
SHA-256: 10a5d4d0352781aae8a254f6e28aa71587c51f02d5f081d21c6036fc95427dbc
font_02_sfnt_off00015fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD8 10844 bytes
SHA-256: dbd456c72db2072a8261004fe280f33e803a0475759f18bfd3328d9728c4427d

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