Malicious PDF — malware analysis report

Static analysis result for SHA-256 266aca160f5a73eb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 03:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e661d37bc6f64ff294997838174858de SHA-1: 9f4eb40d054a51e945bf1cb4d58b632c5ff77fa9 SHA-256: 266aca160f5a73eb66abe761a2f00165fca6784f9e53daf60cf4b56606df3ee6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jycjqj.com/uploadfile/file///2021082614484646.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/eb76012d745a790a02072f3b1dd9b5ea/67135960736.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sujapuxepeko.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/zaredekuwujufi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/18654277109.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/61720279734.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/rulorikud.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/jokij.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/10326766236.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/kusofisaxumi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9c808a21---lirajaxaramuf.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/59b5231a62efae425626219a751750fd/33028527891.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147883af21---8060919984.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e78329704---talupesusarox.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/70105019856.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/fomevepiwumarutozadu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160833cb7e46bb---8729987327.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/pomusajujizanonepuk.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/fdf2ela4hll92v8jju0prgqbeu/53848343208.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/evlhh88712j4o25iiseaje7m0j/newixenojawinakosifuko.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/nivumemasibopujusej.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/84666089673.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-26/20210726005412159197.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/fimodenevofubuge.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/zafetepeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cooperative+act+2074+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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 17020 bytes
SHA-256: dd580b41b34d3100cf470e93a7f5bd815f195071f368787ef728904a416f1966
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 10764 bytes
SHA-256: cb0c84d61e22fd9aefbb14e9ded8ea28b252e927a63999e17b9510d1febc424f
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1