Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc6afa4a7c9a22…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 03:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4b3b814fbd71c1b5292020ef769a0b3 SHA-1: 8346a63a718fe8fecf9db382ae85f3b788f60f8f SHA-256: 8cfc6afa4a7c9a224e57d60abb9e7118e26287ca2c569b4396f530fc853bae19
156 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 numerous links pointing to compromised websites and link farms hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the nature of the heuristics indicate that the PDF is likely intended to redirect the user to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=run+3+winter+games PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/38cf1e067b26d7de07ddd8c31f3ac1a1/31222557529.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56e33a2e89a0fc7d43871f6a5e5ef7c9/poganofanewibuvapaki.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/504608_9988664514.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • https://majubesar.com/contents/files/wudowuz.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/dewexota.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xatal.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613253528f993---zisufurukaleto.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/77357685320.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bfcc6ea---fifemaxodeke.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/72049818183.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/wewakigekes.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/sabinemupadevivi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/xoker.pdfIn PDF document text
    • https://stopserv.ru/files/file/99707658837.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/perisaxazit.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/relit.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/uvsvfbohj6n71f9e4a2fq6aq1j/93029266500.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/labumodelunejunisemiwevup.pdfIn PDF document text
    • https://izometal.net/mm/file/mufawopiku.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/76465319760.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tixurijadofuj.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908043803.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_off0000b777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB777 15820 bytes
SHA-256: bda9197d44296d595faf2f420bafdc18bda00c90b8301dfa9185344a3a74ce65
font_01_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 10688 bytes
SHA-256: 4cae92ad5b26c8ff2d78953e2cd8cbfc3004124b50d6ad32c3cfccc09e4bcf74
font_02_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1