Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eca3cb6dd0c5a96…

MALICIOUS

PDF

70.9 KB Created: 2021-07-10 08:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed71cd6c6017a8111a9fe2844c0cef9f SHA-1: 78ae822b956548dd4ba332be0bcf0b7a2d0a086f SHA-256: 8eca3cb6dd0c5a9668a3a9843c046cef4f02fb9f33a5f9a6fccc04da19b3cead
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=ar+sling+mount+end+plate PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846af146433---fezufujevexaguse.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/dinabubilemapajuvotixiwem.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160923b64d15be---94696973549.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c371f957---58570057520.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/folajunowawuborugadoroxaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4682589c618fb6544c8c73740f058e09/55762301937.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/97370715585.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/79515780622.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fm6hlpthsqqkp3p2bfvg6bvoi7/sopetopewogodegojufasexal.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/63985858809.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sesoboxi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/eeubvaroataksibdl76c247us6/77696576122.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/vidifamatuvak.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8fulkeh65smig2avkl094pccrk/pazuzunawejakobobokex.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/l2pa2ofd747hm5q7rkae40o896/40177097967.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/81ba4981664e9677f594b1b00c59dd07/38390261411.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/34818679749.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/77001915129.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d9adfb73ed8b770c171d0e5daad71ec/73178106758.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ea79a6df---78745307886.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3b86f00c92713609fadae238e3ee07f3/50196210020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801094635b8---vuwinukosefojudum.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd9f3aed7---38284212720.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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 15508 bytes
SHA-256: 077ef856b6ba7d236d9d65707c55a7eb52ad84305a35872a1d2833b6967b7deb
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 10816 bytes
SHA-256: d85601b8444004589281f668bce9b4c0c94b871762ce5ed68e59e1817d06dc64
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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