Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ccb6a28cc4464…

MALICIOUS

PDF

68.1 KB Created: 2021-09-08 09:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e70b5644ae7bac93f0432eef5fea8980 SHA-1: 2e5615ea9179855e5cf98c12dc1e49e2390eb00e SHA-256: 0b8ccb6a28cc4464832de19e8978d65674fd2942f07f785866d8ad60c3947408
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs are designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://thunderstar.cn/userfiles/file/20210501005659300523250.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ng41qggiuu2uursfugc8fmjc9i/88281548229.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wobivalenenelimafuviju.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/75648667788.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a633efa75b8---lajoregegoz.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/78575323259.pdfIn PDF document text
    • https://tekartltd.com/upload/files/vudavebotosadepu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210829084715.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/7805985621.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/fijalaxexidevugowamofaj.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/dusuwigasesopunezulu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65795d49a4---98195099229.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/gaweg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c25c2610b---46390272239.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/58137388247.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/wivafakoxubig.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/59797499661.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/nekoxuk.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/jotuxugegojabugafogebaz.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/750e0bc4bd3fd72d0865cb428b8ae9bb/49829010322.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b10a1569---27742084307.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6dd13f9898409d64444d5f290caa5210/zuzami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=synonyms+antonyms+and+homonyms+worksheets+5th+gradePDF 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_off0000af1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1C 11060 bytes
SHA-256: 7945c4c2dacb524c48246beda09737ae2daf9baf6aa99c4eeaa9a341b9aed948
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 14300 bytes
SHA-256: ab110e57f7861493fb98f03fe1de30e2dd9ed6b614029f043c9cdf9764140f6d
font_02_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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