Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c275e222b5d922…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 21:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f013ceedd9389d6fb0679c2aa0d78da SHA-1: da8bc8489608a91448e1a175247c2dfc9a080d26 SHA-256: 66c275e222b5d922c56788a82d19c34987eecd53f25d6fc41a15b5a95f20d1e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

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://petrovsky14.ru/docs/files/63493908086.pdf In PDF document text
    • http://ap-qatar.com/userfiles/files/mumapugar.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ed612d65b8763064b4c4e1cacef5b48b/gobuz.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/sogonikutabulina.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/62339130910.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taretujekufedatujede.pdfIn PDF document text
    • http://carbontuning.ru/file/47431162600.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8388242226.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/6998473909.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134950e5d009---vuvetepirebi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d8d40d2e---sosupudosoliwumixulusebof.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/69428754079.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52135789505.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/zatosudaw.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1241584576131f5724bdd6.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/83784999605.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/52731320786.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133653361c84---16165999808.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/43510128542.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nimavafapixijomukegevini.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kebopavimejunavin.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cf8814a21f82fb8b4b79f0d25d06367f/sakel.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/22375004338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oreo+app+apk+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_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 10228 bytes
SHA-256: 3f39e1c2fd9cc124948a98c9c98bf55bc76b25c8b7196750e39be006aa427439
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16772 bytes
SHA-256: 10d61cdd63753ab5b5d4c19bbe4ed77106dd182300d1b49343b813f3ea09b691
font_02_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1