Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ecab00fd141789…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 10:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9f8a16cbb7b9213aa0126e01751aabd SHA-1: 49d88dbcb0e8fe5bb5ac849b67d995baf2814e3c SHA-256: 75ecab00fd1417899d8d10fb019eef3c7520dfa815d27e0c53c43422af1f41a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nbkhjc.com/uploads/202109/file/210905185656420429p162xfvudxgk.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50680d101---21897992120.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/wosivadamatovenanazuv.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0d206d06---zokakowiradav.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xuvobopezi.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/93761770294.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/vesube.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/legovenujevulot.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/64909673852.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/69995171836.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/56254587162.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kekidexatimosi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/da74c08ac57c191070928d16ae5a834a/miditakuvigafuwevoponavis.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/kosenotojenarote.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9ebaa83dbab89951f5cfdbdeb80a36f4/wozuxafigafipereziwub.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/lanesinafuzugobopa.pdfIn PDF document text
    • http://sbairs.com/datas/files/sofevadisedokuwuvewi.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/dusesowebenakovejaj.pdfIn PDF document text
    • https://ghnservizi.com/file/60485228416.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/xusegakojokozufugutetube.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/nimuxaruzukop.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/89649479171.pdfIn PDF document text
    • https://norservis.com/files/files/fumogatunusetadasidowofux.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5ed213a464199607e35306a0aa746447/92122250369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+best+ringtone+downloadPDF 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_off0000b1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 10632 bytes
SHA-256: 7fc9d007c5eb403342ccd997788bb9a3f0c675224f954774c2d225fd501fc1fd
font_01_sfnt_off0000ca48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 14212 bytes
SHA-256: 27914a1892b93eae60ab8e44dc3ce0df2db826591e5cc8190133b2ed04fda481
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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