Malicious PDF — malware analysis report

Static analysis result for SHA-256 de392b8edf93f68e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-26 15:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6558e8068fdd04e7404c6335249bae36 SHA-1: 77be72124b94a7368d9b0787a82ca0343d461ac7 SHA-256: de392b8edf93f68ec9a3283c6c2f817eb97472bbccb708474d4e5e9350c2b06d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of links to compromised CMS upload storage suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/30083328306.pdf In PDF document text
    • http://jagdrevier.hu/upload/images/file/tilunaxoxij.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/9739518185.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witamimitoti.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109082207264367.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/begusaj.pdfIn PDF document text
    • http://tochalco.com/uploads/files/mowuvir.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/42616995394.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651846d184---2151917590.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109230959272238.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e37150e97c---noduzuwezu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/25053947729.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/18256441898.pdfIn PDF document text
    • https://expomediainc.com/upload/file/20467187064.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/41330635747.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/74472474590.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b39acbc710---34957514589.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e751e85792---96893251758.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/nifofaf.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/59965287804.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/diminopu.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/mowamepokakimuf.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/dobesasojivaloworixax.pdfIn PDF document text
    • https://derfo.info/resimler/files/82208281383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=d%26d+xanathar%27s+guide+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/30706986016.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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 22764 bytes
SHA-256: e4ae55e5872d67e22c68c37ce28b4590658f70b5b5392b82df3c827abe46cb5c
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8