Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e2ba0fae1f7f38…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 14:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d92e0ef8fd474a607bcd0ded8cb66049 SHA-1: 08542a9b9c4b5e2abc1116696c2094af8e2ce8fe SHA-256: f3e2ba0fae1f7f385711ffae15df070c351afe3d557a961748e2f51c3fb65a23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. Embedded JavaScript was also detected, which could be used to facilitate redirection or exploit vulnerabilities. The primary attack pattern appears to be a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=sec+media+storage+what+is+it PDF link annotation
    • https://bike-accessories.supersites.gr/content/ckfinder/files/49809997219.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/bavinex.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/60610471704.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/27136498451.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lojokip.pdfIn PDF document text
    • http://topp.pl/_topp/file/gijilarifid.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/basegetuforatokuxabat.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/84880578840.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed67def96e---gipepejuwavufevafor.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vilenoxoporepanaka.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210919205456997752hvyoz3xybp2g.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/52901542088.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/nitexugitagilimuruduxev.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8702fdb25087f8a0cfc5e715430f381f/93504291291.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/61569779668.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/xusopa.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/dojodaramegijajapopidu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3f05d0db---36495558879.pdfIn PDF document text
    • https://jetaime-shop.com/files/71210650718.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nrmd35pk0b2lbrb4bld1h8j5hf/87175146232.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bimazuzifovafixawarusi.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/93830320065.pdfIn PDF document text
    • http://roocenter.ru/upload/file/69881727902.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_off0000b3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D8 10828 bytes
SHA-256: d1a9e2fa689cbfb8f3deab154bfa21e0c24007c3af18520889af7d4696691ec5
font_01_sfnt_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 18472 bytes
SHA-256: 02581a77f1deab630189a903a1276bbad34b2a18b1adb43f7652e9dcb016f49a

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