Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9edecf2c27963c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 05:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c574bc40698bac930adf176bbe4ba630 SHA-1: 18b8fee5dcbc2babeb1eaba5cad6d0ed6d0938cb SHA-256: bd9edecf2c27963cac08af42c021358e4474a72e8cfe132e8a57261e108683be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the link farm structure suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://lyzjkgm.com/d/files/pokorajidalelifin.pdf In PDF document text
    • http://beateromer.com/bilder/file/safevitumetexuduxamu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/popcpga9d0563bnfk2m9j4b2n1/80279087689.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6ab17436a86c46c7408d1ffe6411dcdf/63391694625.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/10191903546.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5792370e9a6aa99117c65a933d49ba7e/tobavojoraralunorujorete.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609913cde7229---65736187751.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b42d0ec6e---25444061576.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/zovusul.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2f58069f---fizuburog.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/foruvidizuzaladowomepites.pdfIn PDF document text
    • http://heureka-cz.eu/files/xawovobeni.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/43018061334.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/742e70ada2d865b64e640f2b65da3b7a/59237095591.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0362bdd78f---22999063234.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xedegiroj.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/28o5l6lf80o18gok9gm44jgmp1/30632251168.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zemukovinirawemiliras.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160825510426fb---dezipov.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/60f63040da45672bea3602eefef947f7/biwetoxanawubomudabito.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/19272707468.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7f411c00eb3010b5503cfeed2ee332d9/17298957275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=first+fuel+injectionPDF 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_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 17004 bytes
SHA-256: 21f4f9179c6e6f14c6dd03c1e9e0a18365ed09ac4c7fc83b27b66a111b66bb44
font_01_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 10372 bytes
SHA-256: 5f652ebbc35c1f11f0a373ccfd112b778e0d974936248f2002e46796196cc0ce
font_02_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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