Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb3605011d97553…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 13:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66d967f84c69c864ec013646af4cf868 SHA-1: 3ff60be308f575cf89e32401b488140466dd1c81 SHA-256: aeb3605011d975532bdc3aefd7e49a0fddb35659f5acb2c54fb35ecc8b18b06a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=english+file+intermediate+plus+third+edition+pdf+download+free PDF link annotation
    • http://emblem4home.com/UserFiles/Member/File/fojibo.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/wemomimuzezuwin.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352461b65b4---80108682932.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/63921201043.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/37481897517.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139572b17f0f---neburu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/rimup.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/jovisulokofas.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/nezuwukozuwofazus.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/6808966838.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/96130481508.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/26419141250.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/75347915356.pdfIn PDF document text
    • http://tabletopad.com/images/file/75828168393.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zujuwawesizomakizinimuta.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/31a8d760c83f75a5d3e443031bf0e6ce/64308122935.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/62726014273.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/48586750306.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/neroponeja.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bijavesanor.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e4cc6ea8f0f48926d7bb2c1edfe96196/45562460630.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/93517523489.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/betoje.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/venavubulolexikamopavar.pdfIn PDF document text
    • 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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 11116 bytes
SHA-256: 9189d443ca64b22422f938b4b0ee999a9110a4084fa2ec7522f894c8eb7bfbe4
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 19672 bytes
SHA-256: d7082197a74bdc24b5c696d102da2e15517bd58253339a941ecb129ef2cecde3

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