Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc7ce5b71ba85df…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 09:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c34db57d1144f11cb2fe74e437e2918 SHA-1: dc658ac5b1afc460711a7a32262b9fa5ce751633 SHA-256: adc7ce5b71ba85dfda77c057f5b5aa8eec493190d39c1f43d758fb77ee958906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised CMS upload directories. The URLs suggest an attempt to host malicious files or redirect users to phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=csr+2+cheats PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161442244026a4---2481342637.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9cbf956106178dfca8ed7c9702b5f4c8/16872614014.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e82d2e7d86---sovonogenozaguveken.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s29qv6kb0jk7uh1u1jrkptud2u/93324900522.pdfIn PDF document text
    • http://vln.nl/files/file/97902128271.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/lazevawudi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/92f8f493e03688dde1b70cd899a8354d/xemadezujapejup.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gowadowalufi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/775a03a516fbf3d094024003da583223/84191120630.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/zumamivelekijabifijazi.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-18/20210918104451689153.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21091306290516663739mimc.pdfIn PDF document text
    • http://specialcats.nl/media/files/72444017286.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447771c0e94---zanalusimopikew.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wulomobax.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/96665884964.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vugejimagaxefafaparo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/82633156027.pdfIn PDF document text
    • https://bfull.ru/uploads/files/vovukivo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/gevigifenujot.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/pawixobigubibibazotutetuf.pdfIn PDF document text
    • http://okun.su/upload/file/69480905378.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/susijidinevitidilesuze.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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 16184 bytes
SHA-256: 3614a67a41cb49b0b8acff07f91901a412a38f502c6fa03d16e41b33defc67ac
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10116 bytes
SHA-256: 9b0a20accd1e5ed8d4424b01db2077288bd29d90c1c5824b3f2b35880ed9cc99
font_02_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1