Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff0edb126b8234…

MALICIOUS

PDF

123.7 KB Created: 2021-07-18 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b2df1359cb49c183e7dad7d5b6a9b1 SHA-1: 87f9dde529309f1ee7e0c807be6c84486e6ba1f7 SHA-256: 53ff0edb126b82342b92130bb7a2f024a5e3265b18d548afe7c04e47cf995405
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. This pattern suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inglewoodreunion.com/clients/68690/File/47727641444.pdf
    • http://ebslang.net/_UploadFile/Images/file/69189061211.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091062f18fb7---85268573051.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/243c53516069dac057c3aef06ebb0fb6/lixifutirumegurozuxevup.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c434f68008---8486854967.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b889dc1a8cd---96576217755.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a489ed91b61---madoxoxirovix.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a5338b32---numodurev.pdf
    • http://adabaskimerkezi.com/upload/file/melafit.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/51108da34df4643ab8d7581deeef10e3/bavofuji.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9763c85edb9be6e553da3249f4e0cbb/zijifufawisabigana.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e288f026ea---bosivazimevukalesefam.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb608b686d4---gosijuvaxifuzafufipibap.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/aeeb6af363419e8adba5dd7908f417cf/gulekodifipini.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccba82401---50411595041.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/70741828261.pdf
    • http://matstravel.ru/userfiles/file/18338387635.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac520f97b---japugemeki.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4b8125ad26527bf0b9a6150912d30a5d/lolitugotajeradamebesoz.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaaf1df23---mudajugezopiw.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbb5e9ed2---boselobuzuroda.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/150ff60c0245359442c6459c96f79970/89919301449.pdf
    • http://stensoproject.com/userfiles/files/67119256744.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stress+induced+hyperthermia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017da7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA7 16792 bytes
font_01_sfnt_off000195b9.bin
f453a45e410675200837dd28ca226b183248dfd7b459b97ddb245e6d0950b8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195B9 19776 bytes
font_02_sfnt_off0001c828.bin
0ec3b5c385e1a836efb6e4d5da66ea48f78c8e87b9672b8fc4ef28633e037b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C828 10900 bytes

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