Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacc15fc47f0526f…

MALICIOUS

PDF

126.5 KB Created: 2021-07-20 16:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 830dae09f597e97ff69001ed9195dd89 SHA-1: ed9c01a04c77080c6d80ab4c787815be3fdad62b SHA-256: bacc15fc47f0526ff6748ab492e1bac30f738e176a8fc24fe73e4212666d0c64
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document's structure as a link farm on disposable or compromised hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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 https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f53a9f4849599ddb4fbb9b36d2cc5dc1/67707743780.pdf In PDF document text
    • http://ghioroiu.ro/sites/default/files/file/69667468047.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dc1303c5b3c.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/71212327784.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/wesategut.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ace43dbae---tejirakurexabofuwurize.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jetafuvafamin.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a353da7f4ba---zaremulebenubelufo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0990685d49---67902153391.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/kolefa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cac4d9f5---70905730691.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e43c9bb43---zorejetevutuf.pdfIn PDF document text
    • http://vbs.pl/dat//file/1029546252.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/kijezawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094567e75b2a---9442561030.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6e9mpbgalg3f58q85c44ar48et/sexijovevufom.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/81653550966.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e078b30d8f---popemoxe.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/97090077515.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20346882483.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/90545503213.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210702_361666E06266D0E7.pdfIn PDF document text
    • https://onlinendttraining.net/files/xipadet.pdfIn PDF document text
    • https://sy-tech.eu/file/30610890526.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h54c558lnt10k82iclq6j4cvda/nesirilixewopiguvidutimo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e832eef48---58559309796.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8gfpcg5eke22u2g21uhptk7iq3/94806779210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=motivation+maslow%27s+hierarchy+of+needsPDF 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_off00018de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE0 11032 bytes
SHA-256: 7f9b5e2c5f7263804a292be932c94585b15dbc19695f681e51cbb3b66ff9fc2d
font_01_sfnt_off0001a781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF93 17056 bytes
SHA-256: a070d76c9217bad36243bafb0214594141a02abbbfb11d02544db7ad0daee14f