Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ca1745e0772635…

MALICIOUS

PDF

75.3 KB Created: 2021-07-02 20:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a1b44fac49987b9fbd5ffeec44ef0b0 SHA-1: dd4b0d200c6feb51e30b08cafaf09b40a5d0f160 SHA-256: b7ca1745e07726354b3e9ee90f5be7307d175ed471f4b0809af570243094cf13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of `utm_term` parameters indicate an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=thea+stilton+and+the+ghost+of+the+shipwreck+pdf PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b052aad8---62770989317.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb32cd9550d3659cbb3b89868ec01957/5124061612.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608353a4beb51---mopigabiteliguw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace67718ef3---77169648810.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6al5shm18rgo8ns7jfr6pg01f8/19738432181.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c880da4fba0---20403939164.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///29932635503.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/ramodeverubopexomudipup.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e7b797c829bed4b613753e53a82dced0/jatow.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0533704001624763473.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c86ca3be---pajobawaxedoliwene.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f3ffb2bae2ed07b6bd423d29131acf3b/79039469282.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4aa3c9b9e1b5549031d055b072b3b3d/betebuzabekupovupudowijex.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tv6rkso5s0jfuink05a7kd00cq/78186471084.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/65204233163.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4a790ec4---92687793369.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/91787055201.pdfIn PDF document text
    • http://beateromer.com/bilder/file/xuzosetumigofaxa.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2c2c6e699b992a172be997f12bca1f6b/xepimiz.pdfIn PDF document text
    • http://dejede.com/userfiles/file/kexobukatexiku.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609454dd3e901---49556568929.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d7dd181c---36409236529.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7b111113---62351206914.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_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 11040 bytes
SHA-256: ed602accc8756e3b5072b97a49734ecb96df8ac8a217d04a59a86ca2ccb8367e
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 17028 bytes
SHA-256: 0bfaa85c5fd10f2c37c90a51bd741e6d5a5d264aaf22a0e4bd3fcf6184e9b15a
font_02_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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