Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc600ce8576f74f3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 06:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24a10fd9949a65c9d22cf23c2170912e SHA-1: 9d4ac4304a6eeff30839eba671280976e23702c4 SHA-256: cc600ce8576f74f32eb52da5e4a1de2fd295e3632d50f2293315511893525794
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. Heuristics indicate a lure to enable macros or editing and a password-protected archive handoff, suggesting the document is designed to trick the user into executing a malicious payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://rsun.pro/admin/ckfinder/userfiles/files/wojusogidoveruvaserogezi.pdf In PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/18440991718.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/91511945037.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/jefiregidisijuni.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vakojiza.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vopotodonijilafenadol.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/81454368826.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/85659294392.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29445308181.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/zifujagifawon.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/62123f1539600b989e6e6d2f1b466821/lidesobuwupaxewapuvalidab.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137124863d11---mojedumorotuzewebiwabari.pdfIn PDF document text
    • https://cityface.cz/res/file/85084757023.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/47164598021.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/porekilufasukabuxorugex.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/ligujuwekoga.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613781f5011ce---82954476032.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210910015206.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/78881038180.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/65793170643.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/40791587568.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/natapazagagojok.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d54882064---30307719974.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/vedezamep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+lock+pdf+to+unlockPDF 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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10480 bytes
SHA-256: 321dcbbb8810b2577c802022f2cdd4c39e183b561b09afbf723d5e8971ce6751
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 17900 bytes
SHA-256: 77a9aea870b2dadc37b21f7704b4512c52f5a2e8ab915f49e6a00ed152f0dc19

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