Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de0ff6b7aedfd2c…

MALICIOUS

PDF

76.2 KB Created: 2021-08-16 01:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 077d0cd8a7c47b2b59de7a94476e0cce SHA-1: af08b822e0dd0096f40238cf053de0288afac266 SHA-256: 4de0ff6b7aedfd2caf876e3355412666923a037f541f3cf2f7533b4f6c0eaed3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a tactic to distribute malicious content or engage in SEO poisoning. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards an attempt to redirect the user. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=terraria+mage+armor+guide PDF link annotation
    • http://lblussana.it/images/file/gijexidaralovovid.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1nbr1bmf47qsuarrmf9dtha6b2/mofupotegutopigisixoduxu.pdfIn PDF document text
    • http://2440027.ru/upload/file/rozixakorap.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49102b91cbffbe39d7adb9f21b7d73de/10236910846.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210717221248.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c61ae41c---wakidoxizi.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/82756654529.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4oun0c5lt652hp0smvnad1prkf/lusupokotijigan.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/zofisewo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbecbeeab4c---mazirexibubejedetof.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160898b9ad0447---sasile.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/51665417932.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c4cac463---bezedijiwurinujebisex.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/59947465028.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sokomuvedibanajod.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ce614a6965ab1a55f045eb5a06915a29/lopelukuremadimij.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/34397496192.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1a32af9237469ee37b4425ea7891ad79/wojemamatijela.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6b017d264bfc8ebbb8c3503c3941626a/kikopatadukazow.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95a5175e3949816d123846aa98be9362/jopapevori.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/73879924765.pdfIn PDF document text
    • http://balone.net/_upload/file///95323233553.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elementsIn 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10240 bytes
SHA-256: 346b5404cb9f61a12edcf1d91c2eb54f7a000383da2b319277b4bdc9e7893e03
font_02_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 18544 bytes
SHA-256: 9bb8f8890767e7baa04ca77e69fdb0afd428ff1c9a82825287b55080cca7d504