Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0f50227ee1934f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-23 10:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcb10e128602176eb9187be053e6ebed SHA-1: 1d09a30fc4f1822bce81ebd36c86eba67c5e7a17 SHA-256: 6d0f50227ee1934fc28d798142b78e774ff8d56c0cdf90084b9ca1f0ce6ba849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnfjg88vr4r0t0rrla03ppuaed/nozivuvoxawur.pdf, are likely intended to host further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://mnwebdesign.dk/userfiles/file/kolutixosasowekigefabi.pdf In PDF document text
    • http://cosmoscm.com/contents//files/nisetitijebakopuwa.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/55649167743.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/59544526868.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/49972610501.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60193157339.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/42979211049.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46894494228.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gizesadum.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xuxuzuzo.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/61655063956.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608959246c69f---towadodafezumowujagobot.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d52330eb---73103286609.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b5379d76---36368687792.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/riwugotogilal.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/foluninaf.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/53361057187.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozarirafofufaker.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nm3fs5g048ssfr74sn6v5r71gd/pemonidivalegubudolerudod.pdfIn PDF document text
    • http://katachizu.com/img/news/files/mudaxajedigiga.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fb3282a9---79149895207.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnfjg88vr4r0t0rrla03ppuaed/nozivuvoxawur.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076433262aaf---40744136303.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/81m5pcgvmkdsq9apfujla6qbf5/73085014898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+download+locked+pdf+from+websitePDF 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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 16928 bytes
SHA-256: ff668c5cc8e3215ce6722cf7dbba5ce26aeae7af7d3822f8f71b4f3eaa377503
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 11092 bytes
SHA-256: 3eb6583d7c6538095d20741eb01dd375a5f8ac5163fb537d082cf447a26118d2