Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bba9e774555a98…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 16:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc9828ed485aa415e5fafd994422bd3f SHA-1: a97a7807a1301c0eeb072b5c39c1a90995b0ad9a SHA-256: c9bba9e774555a98003af74c5d797fcdd71f3d96af3193e991969f0e716c2af1
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially malicious PDF files suggests an intent to distribute further malware or conduct phishing operations. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://vetportonaccio.it/userfiles/files/82872097170.pdf In PDF document text
    • http://www.vikingmaterials.com/img/velaxawubolekutojanapilag.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/96oo8kj0cu7f4tkf85712jq55s/97140246308.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109140329175371.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210912123145390830xazk2f.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/jasibugonigepidovunoseb.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/25762171868.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/76409810175.pdfIn PDF document text
    • http://njchemland.com/upload/files/54495480153.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140360cbfeeb---39382881535.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161319bc7804a1---61010034699.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sivosanojifevimukife.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/91109911539.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/buradatavamadirasoxulok.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/pubiwifotogabo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/25697823074.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2078e5824be19ffb25487e841b3952d/zerisutamokofukavu.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rofuvozerov.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/18563499304.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/kubibepunajume.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/jidabad.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/wazawesibuzuvigesurema.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/2843946721.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/sikejirububi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=birds+of+prey+watch+online+123moviesPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 11548 bytes
SHA-256: 300425c59e7ade317da181a72f9d5b1a122b85a5b33d853c1e3ba3a4d2d64e46
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 17556 bytes
SHA-256: 6955eead77fdd098bfeb57a6c42587dee9c1c8077ce1f3a84f43071b756491e1