Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8d072b4eb6d10e…

MALICIOUS

PDF

79.8 KB Created: 2021-08-25 17:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49825cad8426f9de229c6cc2452c2440 SHA-1: 137d3be2c592d870641ac6c5407dd1cd54f47665 SHA-256: 0f8d072b4eb6d10e4b09e56dd3c6161196418e246979928a90d40017f69e37a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The file also exhibits characteristics of a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to host phishing pages or further malware payloads, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=corporate+accounting+2+mcqs+with+answers+pdf PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a2c858840450e186a6afc278bd5752b7/lojukigumuximemu.pdfIn PDF document text
    • http://bdn10.cz/files/file/vilapimanitakiwibim.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984b0fcbd75---kumajuka.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vhbemb67nesrgplpibfojhc7e3/77097579432.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210704084212.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8054368c63354bfa8a1d7de6015e6643/31147079805.pdfIn PDF document text
    • https://schmitz.cz/res/file/rujefererodugalaboxuveb.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139019561b1---givejaponarivudekimezawat.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/20607696759.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/dagulafalu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938226d96bb---88316682289.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/pipenet.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8f15a9a73a422615b00d7cd432a6357b/97449087734.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/84550033317.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/14202322161.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611063ca4955e---7366241358.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tudoxu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3615cb0258225ac13e082da2fbd84ce5/puteliwoja.pdfIn PDF document text
    • http://aroma--style.net/files/files/27017386403.pdfIn PDF document text
    • http://secretinvitation.net/images/files/50343085420.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/46fc66d3d4982dd3a8ccbbdbd2d979c1/98165046909.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_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 11504 bytes
SHA-256: 4f65d9932c01e2fcb15a27a618d1fca9d947578752db3e0caaf43a8ce52ea915
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16744 bytes
SHA-256: b9fccdd4e4e79f5d4ff3d2b64cc3a76ac11e4f77ae80ee1b3c424fcb3a9ca345

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