Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e65ed2ce3570b29…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 10:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9e3130fdb575f45866c71c383f9f38c SHA-1: 47aace90978a4e8f116cb248560a50466e9537fd SHA-256: 1e65ed2ce3570b29925018e2ca5c0ff970e168274a12cddcf32d90fcc5bd0810
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=knots+3d+free PDF link annotation
    • http://administratieindex.nl/images/uploads/66421668193.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/64009225841.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/49897667861.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210922141411.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/88179495167.pdfIn PDF document text
    • https://avflash.nl/upload/files/nanowebizixisazo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5dd56396---jesorovapuvalatak.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ae91blcuslikp44g9rl7gopq6/16277709875.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80ee38330---47292351725.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/99653774684.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lorafedetu.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/17546298078.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/87614470090.pdfIn PDF document text
    • http://chinazzjx.com/d/files/44516873270.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7b5kji5s9i03th3fetpio46f3s/mulemabawabukixixonemura.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/51953658170.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/5839591492.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/202051522611.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/85207393596.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/23294355539.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xudadejomoduwixiwezoxugun.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/20998146184.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/41251997019.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/15949148463.pdfIn PDF document text
    • https://kar360.com/resimler/files/zodegeden.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/13689356047.pdfIn PDF document text
    • 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10212 bytes
SHA-256: c036fd374f3ec7d330ae40f5c5155ed991173c6ff5bb09b867537e09bd2162b8
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 17280 bytes
SHA-256: 6ee0e609e109f941fd2faa46929344e6333ce5880ecb9a3b22e2c0ecc4100fcf

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