Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38765284d6f64c0…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 21:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1109cbe69bf482a8d1f32d8092f3758b SHA-1: e85aa2b1b8d1afd478eec1690bd97ddd8159dbe4 SHA-256: b38765284d6f64c01433dc5be290212557bd8ab59b6d93eb72a2d63a69b21783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=contemporary+world+meaning PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6c27e0c76ec30796fcd36c13e60f347/zemitixebidu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/92163936110.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d2d04f96e6afa58020d9cb93384e4286/fuwokapavevudaradarutox.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/300544348385.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1917a26def1987e5e5758f0ed3d9a9e3/xuwujopuzafivegezigujos.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727b1193b61---76144875518.pdfIn PDF document text
    • http://malifer.hu/upload/file/48547800654.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5f117c100ea538835424b05c534b2bc5/woxudawewojuxagego.pdfIn PDF document text
    • http://midel.me/userfiles/file/xolapoduku.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceabd8aeac---wutemufogimokif.pdfIn PDF document text
    • http://18554080.com/userfiles/file/32015406665.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/voguwewofije.pdfIn PDF document text
    • https://cmoretv.com/userfiles/6295712589.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54517770498.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0hsom2efbh1r3gs4fl9lc6k31j/53246696979.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ec64fbee---69930755317.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/sugevonifozijujinimanov.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cbdd9ec1e0552c427341dd1ad56e796d/60236501815.pdfIn PDF document text
    • https://aashianarealty.com/file/40151420703.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1164b1665e2f51e6a969deb5be8a1067/58027934047.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/34t079mssqq0vlmi4kcatjhj6o/22885872085.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/29333773482.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092160eb74e4---punupudexogulofa.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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 17252 bytes
SHA-256: b498d10323d799df958af5ac5aa29e56e0b862d0072dd5e96ca5d08a82f41969
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 10796 bytes
SHA-256: 6f9a9cab2ee4ed2905277796c9117d919793080c5bdd0653a1560e17fe2aced4

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