Malicious PDF — malware analysis report

Static analysis result for SHA-256 68959bcc5f5c44de…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 10:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2be938367cef2ba1c848692918b00af SHA-1: 308ebd886054336ca62ad0c18ee9192bb44f0c71 SHA-256: 68959bcc5f5c44deb9c37a7b7a498b4636d50d5ca5eacc56b4bb916df5d6cbfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://dharkaninternational.com/survey/userfiles/files/76367015196.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/47654051303.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43138130001.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143860ed2a0e---64535312612.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/bejegokuliwururugageta.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/69357496719.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/jevirugub.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/91b6127183f8ccce5531793f35f397d9/desos.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0d4e2d898efa6fb8f66b1849f3261597/zigoworijegakopujeduti.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa7bafa5be4b8f4ee745d31f5cf7e486/mudafaveriku.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/28143388763.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/56790496575.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78595705556.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/26de9871f273a3ead1eb6146b0ffdb01/datewopekulowagabo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161309fd5c2938---sawabugedep.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51919167225.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8vf4rc9ndvuhl8mbkrnaa12ue9/lujazudofuduridagunopo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wugidovoberaz.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/bokumukimaxamukidupoboz.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/vamerotapurato.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/tojezamarud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+free+screen+recorder+for+androidPDF 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10432 bytes
SHA-256: ebaeb37656f5ba6ee3afb70fb28cb4528a7e4302a5ef3e58fcd32cc9794b2971
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 17900 bytes
SHA-256: 20833d083e5ac706c936e8f2de71267f21ce9eab96c0f025431dac9f92206e49
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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