Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6c2788011cb336…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 11:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa34a5b4e7b47adffaa0e69a0c74de99 SHA-1: 10ebcde2a067d0a42550d0fc0add652eec62333e SHA-256: ca6c2788011cb33651a8dd9cb45e9473c97b3f9376d590db967d998dfd4e6f5e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external sites, many hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fb467f3d9---kikolagumibezomur.pdf In PDF document text
    • http://congtyvima.com/images/Download/vefekivawonaguvezizon.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c1ed425e---66318369660.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f032ec39---magovuvol.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a1ce8abfe1d0e5715f73ba00502788c5/59582906699.pdfIn PDF document text
    • https://agatanorek.com/files/file/79125745353.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e6403539---59695768566.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/winepuwapapu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/14e65a5fb9c8c92a5f59da6af599f68d/50909449937.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/o5qqf1d0n3g4qhfi4mnvq5rcpu/16031592234.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0898b741---tokewifiguzizimenabama.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/57293317086.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac345266e2d---mavorifezabalibivetixujim.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/rogufufefedob.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/78770991097.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k8eumtegvnmuvgcpi7joej9l7e/80295155778.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/579991435730ac5124a68b25d66cc7df/xufama.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/7025501654.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/34679641551.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xaxuxidoxufita.pdfIn PDF document text
    • http://rhondachem.com/d/files/8170869559.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/31669113270.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946bc6349ec---6500214300.pdfIn PDF document text
    • https://digireg.lu/upload/lelomagukenakerorofevaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad5a3e4bf6---xazuzujugomuxexapik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sublingual+tablets+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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 14196 bytes
SHA-256: d7881fcbe31703806ed1b7ab6beb61ebbcbf488f70b35baf1b47b6bbc063219c
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 10768 bytes
SHA-256: 4d2c3b04e4501c14c68f4dc3879a079ebdd6546ebdd3929a3c7b4c37ea383c1a
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1