Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81137809108412c…

MALICIOUS

PDF

91.8 KB Created: 2021-09-19 11:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 963fe125f72f3e70e57f251660dd3d28 SHA-1: 8334c00e9406789e2829278ba99d17ebdd1fa2a4 SHA-256: c81137809108412c90aaec13c8fbf54e1fc4e38490ed2889badfb63fae5080ff
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3161

Heuristics 5

  • 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
  • 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://suachuamaydemtien.biz/userfiles/file/nafiwusodawoxofezixiriko.pdf In PDF document text
    • http://plechotice.sk/tmp/file/17175108495.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/63448076396.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/4366578014.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613da2863f3d8.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sec2hhk6lvlk87rto30o46od23/42673087344.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24573784397.pdfIn PDF document text
    • http://klinok-saintp.ru/files/57742653886.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/29863047005.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/21863911489.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408ee21d7a0---64335168536.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/70965621459.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawubigetixavavilivatuj.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b9b4b22d498652f597bbfc6e9308ea2c/zavexewajugipepo.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/dulenemifati.pdfIn PDF document text
    • https://dhesient.com/media/xojakodosotisoguwe.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/92905633480.pdfIn PDF document text
    • http://northcity.rs/slike/files/39155981738.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/25864857006.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1c4b16bef3370d3a41b6a22031fe5833/kiruzenogepizimug.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/73097337169.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/12146263185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=garuda+purana+in+gujarati+fullPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/72625852694.pdfIn 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_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 20308 bytes
SHA-256: 738fe621b8ccad28f9a2014b2a0fffe671e50f7e76c9023cf2010f0630936afd
font_02_sfnt_off00015b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B02 10520 bytes
SHA-256: 45875d4075cf6db801d2acfd751307e1676bdec6b977166e9e1a91b4c86ee2a8

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