Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b49a10b26d9c6bc…

MALICIOUS

PDF

111.3 KB Created: 2021-07-07 20:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3301cecc42121dcd0c30dbce4a50574 SHA-1: 683d40bd9355b5b635b9e55bb0bd18ddd3b6aa07 SHA-256: 4b49a10b26d9c6bc28915b56f333438259e983d853195c29dee467eca762c9e5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b1a30da595e95bcf60b04a10675ad015/71123797900.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf56755910---nujizomadofirokuregekuk.pdfIn PDF document text
    • https://jetaime-shop.com/files/sonavex.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091036b1a568---tofudagilusozexemi.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/89247438652.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xevuwegetir.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/vebijeluzusaxapirafekaza.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/degewunisobowijapimob.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079031a747ae---fabuwubel.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/zijorafasuwigovuvelok.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3358fb77---vizolige.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mr4q471oivrfmshavn9btvodck/wisokeduguxewesazerotoje.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/rafirenetepozugep.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfe904c14---janovopotelulenepogobixer.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2aa4064b03bb7a8ace2c25a32f05148b/57438925867.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446467da5b---sujotaxegilavejobepegif.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a5a98f7e---jegawezimerujudusavuzebip.pdfIn PDF document text
    • http://bienbao.org/uploads/files/lejel.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074200dd6a3f---38105335437.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lufitutalikozet.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/22011c7312ea8bca2577b25ad08ca843/86747732712.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f9fdb97649bf675c0b419c992dd4fc28/kiminokuxunexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=molly+and+jimmy+kimmelPDF 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_off0001529d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB4 10372 bytes
SHA-256: 59e2d8e4e89fb9b64d973fee20a6a88e32c24a9480eaf69b81b91e03a37cf178
font_02_sfnt_off00018209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18209 17592 bytes
SHA-256: 3e451a4a618bb0ae730d0296f9e03938874e7556a32b3cca4b4e5378578ff31c

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