Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dee0de42093bbfe…

MALICIOUS

PDF

73.0 KB Created: 2021-08-30 08:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 869c99e187cd4907466e7963d0771c04 SHA-1: dca01cf3a1a6da4ffe378b8ca96b2afabe98876f SHA-256: 1dee0de42093bbfe4e2a5872f8a835b295bf78d7c87de94217b7a0f67a516fd9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=zathura+a+space+adventure+full+movie+download+in+tamil PDF link annotation
    • http://dorp.pl/userfiles/files/69592932453.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/68884331263.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xuwalabi.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/4068451413.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/374045806.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/80448953487.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/82859404050.pdfIn PDF document text
    • https://ancoraeducacion.com/images/75042245934.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a476cce5---92557753574.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c15036c31cd1a7c33d92b175d600cf66/xitinivod.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210724214227.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/79248117580.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/gotekagewusulijesidutimam.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a651052bff7---kodebavuveluwavujufewasal.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujesilovaja.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/76254bf1cf5e4f20e126944520aa4bfa/3050449631.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/semiko.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jcp6hp1f1dgnthu1a3abmb0sm0/19094294180.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nokodarosim.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210614_1EFA47C17444ECA8.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e172c477bf64cc0b7caa8f7d0016d16d/97386918554.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8a0a2db8---91916168669.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/95360978836.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ddbc8d22---givonaxujibijo.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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 11100 bytes
SHA-256: 5a843d430a18dfcd00ef1a4ab00317210b90577758047f2425a2769fc806da41
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 16680 bytes
SHA-256: 46b3dc5d1ba4f6c089ca689468bdcb731998770d52478b89181af6f3dd9bc21c
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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