Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc5f9b743c05d73…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 03:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d123fa5894b3b8da0da50d17f02b85eb SHA-1: debbc6f0f7e47934f5cc9e6290495bfa68371635 SHA-256: 2cc5f9b743c05d73ed62dc4d719a21bdfeb9bb99936d3117541df6f6a7d07dda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs, many pointing to potentially compromised or disposable domains, suggest a phishing or content-luring campaign. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://calendarsunrooms.com/userfiles/files/roxanivak.pdf In PDF document text
    • http://szyqjsj.com/UploadFile/file/20210923194851048.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/sutevetulavej.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/duwuxojawo.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/36252432120.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/ximogekujagazanodisela.pdfIn PDF document text
    • https://tckontrola.hr/files/39667149934.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qa6gbisou6qffd2dnm4db745qc/nivuzokijebobakufobabojaj.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/40298807844.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/48142251333.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/8609752092.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///98663598622.pdfIn PDF document text
    • https://tessuno.com/upload/files/613f208508979.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/29936198210.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/debokizagawixek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10b31e20bb8de3f236d8ec7aef9a20e5/rusex.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/roduzolu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc85dc409---digutapomediviraride.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f74b94f39843dd23b95356bcd85eb0cc/8427222183.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4990004547.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/87500543758.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/8534117271.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210921_041347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=organic+chemistry+sorrell+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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 16616 bytes
SHA-256: bb75ec5c550a96e62b9d85d2283639ca721e1da1ebf3adb717522ce9ece32e35
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11208 bytes
SHA-256: 282ec1b2f111f33ca0a52cb3af88e74239e6f9f4f73add44368460d989bfff52