Malicious PDF — malware analysis report

Static analysis result for SHA-256 040269e7d2b96587…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 18:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0adb34954eceb7393525b8c69da210da SHA-1: 632db7e8a77e8ef9f277417f6514893b3e3579f6 SHA-256: 040269e7d2b96587497360bf9c3bd1c9c7eefaca06107580859f56e441d439c0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=search+engine+position+tool PDF link annotation
    • https://thokhoavietnam.com/upload/files/wesefad.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/53520544373.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/37448923244.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/retelebeve.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f7ab43c9---68478584440.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/72015916000.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q4kfcpr7sdq01d4bfksv07o8t0/33424538112.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3f367fcb4e5e4b64ed31970aeef5b307/69005831326.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68837720324.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/litemadijeve.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/96748263474.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/75961611495.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/81404056228.pdfIn PDF document text
    • https://phuquiland.com/upload/files/nufurafifivevokejit.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/tibomovafabakavixuwi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/lixaduxukidafuxabuxawa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a09150094---kolofumoz.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/mobuterasimi.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109041402563473.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95161884688.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/97235284941.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/xuvukodanojidudo.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/9640196074.pdfIn PDF document text
    • http://www.pvvc.cz/files/33268464180.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/talix.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_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 17644 bytes
SHA-256: ec2755f52e7893788f116f0ae1a5e70ca47f34a8456e3eb7c200dc5ae0fb87c8
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10728 bytes
SHA-256: 86868be8536dc051f08f3807884c1e357902c519b0e1deaaffb998bdc20b2f04

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