Malicious PDF — malware analysis report

Static analysis result for SHA-256 8086bfb9692f40ce…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 08:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed5ec23bdcb2cc074cf70cabbeb37947 SHA-1: 2d1bc92ddba0a1c4ebf8f817be8de4dea1c61253 SHA-256: 8086bfb9692f40cef71823b8c7cd105bb819a44bccf145eb5471314d6874cf69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=can+you+get+kindle+on+android PDF link annotation
    • http://peach2560.xyz/js/ckfinder/userfiles/files/54954433498.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1320532e2---88581831148.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/wajakunigibetuwatagun.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_002247.pdfIn PDF document text
    • http://bresky.cz/res/file/poburigasumab.pdfIn PDF document text
    • https://invest.pl/userfiles/file/252055661.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/85894290570.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210904_172605.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/69733937638.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/61660815382.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d352ae59---tijawiraboxet.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/55778891873.pdfIn PDF document text
    • http://acelybio.com/upload/files/lazozavugosawoledepokamo.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/67529896006.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/wisovusoli.pdfIn PDF document text
    • http://oris-am.com/editor_up/32534038330.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/89183224630.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/46344756093.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/vozedipufol.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/37801469240.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/10ac80635fa49d831965acd8f3860d01/79164905433.pdfIn PDF document text
    • http://art-ball.net/files/file/54608797908.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 18476 bytes
SHA-256: 2856099ab8c58d7f2287fb5dc34b5e1c45fc260b9c868e395191af89e80ed43d
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10592 bytes
SHA-256: 653da1774722c951403d08fa0a8853d5ed3f09946c231558201d2e17e7b8e4d4
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1