Malicious PDF — malware analysis report

Static analysis result for SHA-256 2269db7a4aa7067f…

MALICIOUS

PDF

75.4 KB Created: 2021-06-08 19:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5a8658b9c8e23e7d0f4ffd7aa739468b SHA-1: a1f7a0c4c4b580fd5026907fce73e0b9f4ac1b98 SHA-256: 2269db7a4aa7067ffcf5b4e53e3ad3d37e46c25dd251eff531a66776b5c8fcc4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to download a "darknet deep web browser apk" from various compromised websites. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent. The document's primary goal is to trick users into downloading and executing a potentially harmful application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crysiq.ru/uplcv?utm_term=darknet+deep+web+browser+apk PDF link annotation
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3bjnfg7p9jq26ihls1tg1og01/73309998960.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/16264620404.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/24534390146.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/010942b6522f9c56712113ea6d4315fc/79404813262.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a436e67---63943233762.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f23985e82d79d4826787737489f7a15e/86371276644.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c7b2e9775cba6d4ea4473fe4fda6a9b2/desivuzagex.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c568a82---72679748559.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6ctkodjht885tg2joq58rvpd27/95773454791.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/22030673907.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97b3273c3---lufeva.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8065ab157b---tategenubupikovep.pdfIn PDF document text
    • https://digireg.es/upload/22797040472.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kesozavuzibog.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608827107d766---pixikoroj.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6c03f188---tivos.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2b8e2f5ffaf361bba781b78ece241176/tatog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5216 bytes
SHA-256: b55062a622ac3c554debb73a64240685dfb9fc0ff919aee465bdf0bf2917d0b4
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10812 bytes
SHA-256: 6ebe581da4c0429bff36a040ed79fcb955f57576fc47ad45d4c0e6d5e22b9aee