Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2ba716e80fb26d…

MALICIOUS

PDF

77.7 KB Created: 2021-08-05 02:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6c86acba8d6d8c748f324f1765177d7 SHA-1: ce4d360760ccc8711c3ae8b129b64a00d5f669e4 SHA-256: 9a2ba716e80fb26dcb4d986c94097b27913c74e82a27bbeccc93b0612a311e3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fd156a45---70984164123.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0749f3de9---77642510712.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/47523236813.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e141726c2---gexekewilexebepamu.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/33012406162.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/u0lib0cbp7fvn97adk1obal52u/tegupiwatixobupajofikiz.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/paregofuj.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vudikar.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7603fe138030d8f85d1d05a56842c3c2/63358619646.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210718202606.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uft5j5k36nc5fplj0l9dp46etk/wajujigeweg.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c9262876817faa0ff7786abc68aca320/81161850885.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f4f80781a9857e772c435f3b12f9ecdc/najasakuzukoruvogeb.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/41160916956.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe64d3e6f8---5808613389.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a492dad472---dasoroxal.pdfIn PDF document text
    • http://polkovnik.su/upload/file/mejagabubeke.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b97df5bc22598c5a1aa835d11c7be60e/wamuxurupaj.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/ruwufubuvimumonuvekodoves.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c5371e60---96385153828.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f5816056---44864087820.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/feforonufatajeriginujokij.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b028db6e3---rowapivowozidan.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/gunexejusekusagigaduxe.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rurigorek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=area+of+irregular+shapes+worksheet+kutaPDF 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_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16760 bytes
SHA-256: 8bd5c17b9556954d6702d30347153cba06719225e5465cf679e7b0a3a0f8227e
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10792 bytes
SHA-256: 1c0112e6756f56037001b0fef35d145d5a947f6472da05a44f729f386934d114
font_02_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1