Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9dab3085cca57e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7fd613f8e40bdd1f568a5d3fde77574 SHA-1: bd150064062ac373eab4b04a8f806571322ffda7 SHA-256: 6c9dab3085cca57e9f3005b1a37c4e121739b8911fde9c120d29c5bf77956545
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm aims to obscure the ultimate destination and potentially leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a6ee9590---4546318728.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8755eb6cee0a6ebc8ce25d54e7590065/lotusawawexuwevupupuxesi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/15503601946.pdfIn PDF document text
    • https://numberonerevolution.it/file/85421778567.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/watevijegitavepodupej.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gchia9k1hpjpc3345u1ccpfb8c/dizewuravutefuguxoja.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/49ad27f5b9b02564fb7cf5081e1fd518/kumemidowigo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/tanerunivizuwisu.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/39089984832.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/67889900613.pdfIn PDF document text
    • http://newmob.it/userfiles/files/finezujomufafageji.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/vusimosedur.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906995dee30---vasukese.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84357365694.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/7589224515.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/pokudibawigakawiladiwal.pdfIn PDF document text
    • http://goref.ru/files/file/tedinewupur.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • https://beliangka.com/contents//files/27663509688.pdfIn PDF document text
    • http://446888.top/userfiles/file/zimajutapozebigagiwerol.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/boxupow.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/69267071886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+tame+a+horse+in+lokicraftPDF link annotation
    • 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 17764 bytes
SHA-256: 804ad4a400bb8994a5f8e9fc3bcc991419a3da5aeb9a93f30876d920ab56b009
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 10772 bytes
SHA-256: 7dc8dd4fc65303a6b1cccb9a2abb49a877638288cadc50c71e34eabfd00fdbdc