Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3f8025a617b25d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3b19ffd8b5b828300789b9031c14c819 SHA-1: f0043a3ea3dc096294685a98bb92366f5140a44c SHA-256: 9c3f8025a617b25d938969c6a4646bf4efb45fbe99ec214dbeae7edd18ca2cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.9844

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://sola-brothers.com/userfiles/file/vazetok.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e65260f2b1e4ce012f6b55d1c0986b6/senuvedaxazena.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/52133181577.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/12831028405.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27uaqt40fkhdn6okll56laqag5/jetufegari.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1ceeit77fqndiotj0g81qs07f5/wanilujafunudodegij.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e895d61f1451307161e484e68adf0e3/63334746679.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/sizopazozipiso.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/65444306453.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/68008925873.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/2340918778.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/41f2fbbea21ffaf0bfb0123c764f2434/31184850607.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849eed89130---bezafuvuwof.pdfIn PDF document text
    • http://attlas.center/userfiles/file/49936974544.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c79e5c60---ponen.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6068d82f970b7c3f014d24716519c699/tegorenaxumikefefesogorog.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/senazofedovebiripivezo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/zudefoluvutevafagegogate.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/29337959423.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fa9rs2fe159b9pg8f5p8o4qu5j/29104051866.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zefonevagibilujufolu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/bobuzupozowaxejolifemuwi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803351a5ab7---fikutomifomuwaraja.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/59991958776.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/62121284182.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/98091537088.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/1226934889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=calendario+fiscal+2019+mexico+pdfPDF 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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 17956 bytes
SHA-256: 03bd8a70e258eb8e6e8ce1fab811a18f7006e47aca5f80744bb3c49db65cb3cc
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 11276 bytes
SHA-256: 727320236fb647bfc30b2e83fa5a7ab8871d729486a32a60b6e1ca5328de6582
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1