Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b85129228f83cc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 03:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ef2bd2c9daa834d787bb2ef3c6f4b60 SHA-1: f20132b44dd92ca7d939dce19fb9f9b3a4e3ae23 SHA-256: 67b85129228f83ccbd900d1f083c7e7a827c83d042a88c2f0f33f393fc78d395
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on various websites, some of which appear to be compromised WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://nofatrans-int.com/userfiles/file/wonesewagaruvodipugoko.pdf In PDF document text
    • http://greece-ex.com/images/blog/file/14819579194.pdfIn PDF document text
    • http://standdominica.org/files/files/wovenam.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/60256155911.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/pobivobupapawasazaje.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210917163546.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gezuxurenakikolonuwad.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8c589ea3---xepibuxebavanapoj.pdfIn PDF document text
    • http://terminsk.by/pics/files/kolinatudofitezuvuxopek.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f193c12b2---90353271616.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/51193937486.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/jivekudazigoviv.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5383e2d2---nalusiwekexiwevoso.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/12185501930.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5998c5e2---latamef.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/68735673782.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/bumogijejewobolevasujasin.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/zotasosupemisinukaz.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/17130343515.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/5710843823.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_303AB6CA254B9392.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191455836.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/31354865162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gestor+de+arranque+androidPDF 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 19412 bytes
SHA-256: 4d5acbe406ce0b760436de8c945dc55501208e959f2bba0584d4564ce8ed9e62
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 10480 bytes
SHA-256: 65150a446cdee57cbdd00a0e1291976b9b7623654744d810b3376230aeebdb78
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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