Malicious PDF — malware analysis report

Static analysis result for SHA-256 759a8d9b5d97fe79…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 17:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f962ea3aa74a0d7c2d8e28f882db73fa SHA-1: c8c0d04eb1d0d478a7794ea69b116e5b37003058 SHA-256: 759a8d9b5d97fe7973ef1edb941f2d3faf2a8b262be735aa135efc1b0854f02c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=is+ostrich+meat+edible PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4444f4af67517bfa05c0ce5e7d383e3a/33798140399.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/37766191292.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ffa469752d334be691c7273ece942e62/37739630077.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070132d13b18.pdfIn PDF document text
    • http://vejwun.cz/images/90438178547.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1bf82c65c385dd08b0ea8ddb005d8c28/45845159547.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c845d2ecf298180baf9ce6333ba9d96/sesomamoduji.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lagvmrudkf36oh65dieb237u56/34167936215.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/88325390626.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/38901010057.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70070675354.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b4336a04---51184108996.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/2339536951.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/43960279117.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9230817149.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/gajibopire.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/06036a78e98f896a872148efea23ae8f/91055636484.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/78261561219.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/vevopekoxegikamefa.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10624 bytes
SHA-256: 04d616ad1007eb028234ad78f1ed826e478c53fd1c8e9a6a5e5c6d2dd9e32f73
font_02_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 17056 bytes
SHA-256: 25e6f565235274c20618e1950621fefe1a7d32e8292614dfb006afc69ed4beac