Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d11afbc002ec37…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 14:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a6061d0126a075e226f440f14a3081f SHA-1: 3019add01c61922a6adbe198f71ece3629b58c3f SHA-256: 23d11afbc002ec376e1c5a7923e6c3ed123dbf01ad6973733807b7faa19faa4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chanhbon.vn/media/ftp/file/gelixab.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8bef47c84---87872146023.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/23bj98sd1m0a9mn99pp7v5d94o/78227816119.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/66070840161.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/6590082032.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7938dc3b15---vufoxudosuxamoba.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4135897e10b21c525729426c4d2b862f/42877795469.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/6690338752.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/75815233062.pdfIn PDF document text
    • http://alltechsro.cz/files/16418671455.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d8itplbmcrv1f08g057hh3s9i0/kixetujomitu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/8918620460.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/2286577025.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/38194577893.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/lakogutapubilolafa.pdfIn PDF document text
    • https://promise-land.com/upload/file/73659347159.pdfIn PDF document text
    • http://master-br.ru/img/file/71054865535.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/89624012714.pdfIn PDF document text
    • http://4bx.pl/public/file/14550864645.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/a4vvs4h64f4788a8f4oi0lrgep/46325002647.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/natomajazalitamufolegor.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/46018292993.pdfIn PDF document text
    • http://usateatop.com/_upload/files/153248998.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ee0dda149103be1b82ed4756386c4ddb/ditowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=recurring+or+terminating+fractions+worksheetPDF 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_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 17516 bytes
SHA-256: 0cfcfb12b8fce2f35a49837725ba8abb19f998652cd8021dda1fc0d6c4078c35
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11060 bytes
SHA-256: 56fb94dbd08d8384e274f1becfa3e9529f7e0eae470ac51c4229f9b98cb3d3e6