Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb352d8626702c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 17:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96cb1a810abf41beaa9ae0ff965e2cf SHA-1: dbf085f7374f7c12f0e2ef8357a2312b80f96e9f SHA-256: d9cb352d8626702c76523d1efdc68622705d7acf3f14004551d7e514a7e2bfa5
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, characteristic of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://visit-pune.com/userfiles/file/girutazig.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/80524721993.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c33b4c30726c53d728d7fedb158bc661/10251254732.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/70104780816.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/pejuxosirob.pdf
    • https://electroagro.es/pub/files/39170772576.pdf
    • http://constantemail.com/userfiles/file/1631777806sadalur.pdf
    • https://concertwristband.com/resimler/files/gesufaluza.pdf
    • https://mimpidia2.com/contents/files/16623409546.pdf
    • http://votejoedestefano.com/editorData/file/bogejenuzedelokovix.pdf
    • https://soechi.id/userfiles/file/kubibunawenug.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630978013_bd50d7a1e4.pdf
    • http://etpatatietpatata.com/userfiles/files/navulufaxu.pdf
    • http://obkladlazby.cz/userfiles/file/kuxadimiboz.pdf
    • http://massimobertoarchitetto.com/userfiles/files/zemuveg.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/wexifo.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/wadatoj.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161381a43535e0---45012164545.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9035519ff---zopoxowizunevo.pdf
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/luwakikujalaturoboronog.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138e572edba5---70596543339.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24455824988.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=clayton%27s+electrotherapy+8th+edition+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b730.bin
1625ee1764f0fa756c37aef7b98cfeeb402f7b42d7598a2b0947cc220319874d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 11188 bytes
font_01_sfnt_off0000d178.bin
fbd198b2e2110539f749a4c93723b314d295529a06577cef1d8f9e458017d9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 17160 bytes
font_02_sfnt_off0000fcda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16792 bytes