Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ade3c2a52791d6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 06:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96be620fdac323337022d4964085618b SHA-1: e698ea0b5f43b5ca34259e08d6686e2f264bb420 SHA-256: 82ade3c2a52791d693e0091a5fd03e56c1b6aebc063e66e763e91f08a1fce198
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF links reinforce the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pergamine.com/ckfinder/userfiles/files/silisex.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/25820111127.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/11e6a9465476102429bf4ebe2370acac/8774259918.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/walevuvakelakip.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d56facb249b4a0934b60fcb52a9e961f/13874274008.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aed45eabbcd---tojagapixavifik.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51894233209.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0cd202a8---97974997846.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/42727742044.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7500347---dumonojezijuporekeladaz.pdfIn PDF document text
    • https://chptravel.ir/data/file/xilotiduvozovemimirobafan.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/16472798549.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bajorizininivijaxota.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089405d0c6cc---sokaponak.pdfIn PDF document text
    • https://coluer.ir/documents/file/pasusedafekubepiba.pdfIn PDF document text
    • http://delve-cr.com/uploads/bezafarubezajago.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/kexodumugudewevodub.pdfIn PDF document text
    • https://anfauglir.com/images/file/jajidu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/27181125197.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xaxuxoponejovapomewokat.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48fb2fc1---ribajajuzenuwabenad.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/87717414596e11bd648686285db3b83d/dagunibikutulu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/88325390626.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/fulosiloderemoze.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/23024821263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=copy+reading+filipino+worksheetsPDF 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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 17560 bytes
SHA-256: 61b85ab7aed0b791d7f0100091983493906410b1d0ea542f542c1ad3f9be130a
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11100 bytes
SHA-256: 690189a86eafcc9e44d20a76aa0ee6844bea28d3405a434680585b7a2d4b91de

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