Malicious PDF — malware analysis report

Static analysis result for SHA-256 33952585bc33881a…

MALICIOUS

PDF

101.9 KB Created: 2021-06-19 21:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8ff3a63fa35b5b1eac3b83efbe1198d0 SHA-1: 6d3fab44cb97e284f4b6a73ae6c00eab794fdfc7 SHA-256: 33952585bc33881ac68f319d8635ee8a724a43edbd733772bc8aac401e651189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://campbellelectronics.com/uploads/tatobav.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a3511b2315e6dfd18e2c0ffb3d8416af/81713965716.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/babawukivixo.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/fanezalogos.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/84892a5e1ed179252bfa184ce3164a9d/81810412718.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f66e6147---96676623175.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ddc19de3---nilurapevenoxonatolar.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffa26a992---24148462879.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wifaregewa.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-18/20210518154308635052.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/28694195087.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5vmtmbtj6e1m5092k2fv5sgtk7/bipopukudod.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30391358626.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/934a7c3461097ef4f9534cb89d130a6c/55917862090.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b134bee3cd0---17104625894.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0fe2b0bca75345f0017a80d46f92a24c/kufifiwuwunuxutefo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/13a7920e4099304b525a6ceafb55c819/voberojalarikogeto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cultural+tourism+project+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A9 5280 bytes
SHA-256: bb380898f99de37a3fc8a32406bb98b7df2d919b0784ad4b5ecfe679096645bf
font_01_sfnt_off00016286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16286 12304 bytes
SHA-256: 9082e26acf86e3ff3711ce8c6b52f30b4260005aa557dfd37f5364fd370ff811