Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d4cafd474460ca…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f9f2e31d13eabc92161dcd375e462b4 SHA-1: b7fd658fcdda349ffb1ba464d313b554806a4427 SHA-256: c8d4cafd474460cacde6486d097ce1ad4e4e941913a5806d5f8e8667fd631437
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing users to open a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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.
  • 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://chcial.ru/uplcv?utm_term=t%C3%A9l%C3%A9charger+adobe+pdf+gratuit+pour+mac PDF link annotation
    • https://xo-sound.ru/userfiles/file/43142572087.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/795a49939d25bd0cd5ad70b8e19baab0/lopex.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wiwamezofafabaduvujas.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2390a202c5d000b0d7825a4b63881fe4/kezuk.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/43066895128.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/vovifibi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bfs1vjpnuokp7m96kn218cjt31/14505028803.pdfIn PDF document text
    • http://newo.ru/files/files/fibufivodutum.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789bb64d455---bisetogexab.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/meliperubuvujefonove.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/37072203072.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3f07cb71fdcf29bfab717c202efa785e/wuwupawaruvepigejajenave.pdfIn PDF document text
    • http://epmachine.ru/d/files/xumawenedamawor.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/malokoximivufinelomawitu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903072246.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/12244668682.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734ce90b896---nepopetajo.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/22435107604.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/doxasapup.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0333cbb373215da11cd2b759f10f5d3f/dagelugolakis.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/33902972295.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 20352 bytes
SHA-256: 1b063b71215c41dea8be1033a8d0f65a49814390daaa6efa61893d2ee5757fa3
font_02_sfnt_off0001396b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396B 11152 bytes
SHA-256: c4f0f05bd842e9d7a2cafc1a6c1a5ff35e0b0283761637899fb11276837e047d

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