Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b061422014343f…

MALICIOUS

PDF

79.6 KB Created: 2021-08-23 23:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fde02055f02ea6f54f09c63580eaefd3 SHA-1: d190646c11118b17c73ac2891b00861b476fd292 SHA-256: 17b061422014343f3e4ca06483616b70dfbe4b1446f206ac7e818d502bb45c3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external URIs pointing to compromised WordPress uploads and disposable hosting suggests an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd735ccf51---jewakot.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4a995dd7ea85cd745e8330f8fda82c22/jumubetamovuva.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/41540338569.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/82947d6c47cf914c52189bd17c792539/nulisexug.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6682ef0515---tojosibuliwe.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/136499930960e2fed738203.pdfIn PDF document text
    • https://tessuno.com/upload/files/60fb71491ba80.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5dhkgedjteam6dog4389k2h233/58975498390.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ce160a1e---30977005791.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/noxoxodoziwinunumigugomu.pdfIn PDF document text
    • https://wasael.com/userfiles/file/33465143191.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/wuvurojepamelapusegatade.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ba412b80e1feb2934dc23dcbbd3a163c/riguvavururamadovifeboti.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/76kkqct77rvfu3hn917bei4mpg/57772061522.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/34339207536.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wifofoworepulutezoga.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8vbn5na7nc39pv271p4qub3bq0/39336504397.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/97947303658.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/maluvokemi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9tvm8sqse5d6u156vqami79gsb/50965783651.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/jajigebezovopure.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/zamebadunevave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+save+a+powerpoint+that+is+read+onlyPDF link annotation
    • 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_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 10748 bytes
SHA-256: 5440b872b8aab93f5b5e69dd6c45aec239a635027b1f370c4fc0e54bc0e36d34
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 17164 bytes
SHA-256: 1a397f7cea57c8bf64e0b099ede00b32be3c8e2571560e0395d754f1e34f41e7