Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08fe3c69b8eafba…

MALICIOUS

PDF

85.9 KB Created: 2021-06-11 00:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1f53f518d260c4f9a30faafe8ae8346 SHA-1: b0e685be24b9a690439508327ffffec124fd1b06 SHA-256: f08fe3c69b8eafbab22a8e3198e9f42ad576f91a090ed08e9ddf62f6275cce02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document exhibits malicious behavior, as indicated by ML classification and ClamAV detection. It functions as a link farm, presenting a fake CAPTCHA to trick users into clicking external URLs, such as 'https://huntic.ru/uplcv?utm_term=more+followers+on+tiktok+no+human+verification'. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://huntic.ru/uplcv?utm_term=more+followers+on+tiktok+no+human+verification PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a5ea33f492bff8ccc397575c1e08351/memubutemalemig.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/mefinilasidulumuxabe.pdfIn PDF document text
    • https://airshow-bg.com/file/lejawuwerigawakobita.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8ee1102c68eea1c68e83b7f13b38c79c/famumexubuwak.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/s4dnihm3hfelg7cbj4vljs0o63/58913281428.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a9556b9e---gudepesuk.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/441a4e326706b3d13e64f083184df530/2334605422.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6228b26---nawaso.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/10ea5de7aa9e14bba2c75417457b06bb/nesewum.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/442d491491f80e27ff099654afc3f511/95835835008.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/duwuwe.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160773987c0f94---34609911268.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zofasesuwanixobadado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5340 bytes
SHA-256: abc865747b6e0b879b3dd9ab03fa4e2d27958818f7df237437bea80eca390a88
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 2916 bytes
SHA-256: 889bcb535b40d6abc2d6c3fa7c1b2738e48e02ec663ee5ef4cde9950a9db7a38
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 11304 bytes
SHA-256: 5da08e41a1f2596445feff294f7a231d50f1dd6beebd1b31227df95f18564b88
font_03_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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