Malicious PDF — malware analysis report

Static analysis result for SHA-256 e313166283956f38…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 13:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 547595dabad1c27088c915570c72582d SHA-1: 6b4c3b42f83cd430ed5a023c71e0797ac4415628 SHA-256: e313166283956f389e8aee8548b35fbbd21a042014f5b346c2be2af7e4e1d210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links indicates a redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/dbbdb4596d3496ee1bf24879d15661f0/vezajifuwefixepewaronagu.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/66247604621.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ee805db45defdfeb5b548637fe611a89/gafakopuwovebifuvova.pdfIn PDF document text
    • https://nomortiga.com/contents//files/19924613511.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/rusij.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2c469d9a---87402716310.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/kuwew.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vipafax.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/33912215519.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8211cc4c---28480713791.pdfIn PDF document text
    • https://bdata.vn/upload/files/97544396770.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46088554225.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/2278179651.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7a594c0a9dd6bf4cd42538a70403820a/fezojefig.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c641ff23c7a3df3db4c792345217c82/dozorasuvepar.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/pukukixadefejezagenugebi.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/46818202211.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mutanuxenitujuso.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/86436471978.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/35336388970.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/78cb31cf948bc4c6e85313ff4ab26dcc/pojivodifolifod.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rufc0mvocf5ei496hg4eejkack/76579382478.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a68e97652b---ginuwivujadezunelifa.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/jefavexux.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c8da96b5---togoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jaspersoft+studio+tutorial+espa%C3%B1ol+pdfPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 18828 bytes
SHA-256: 12c30a74f6449ef6cd7227bfabd97d81f97eac9a808a5e1a7f52946bb0cb9dee
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 10684 bytes
SHA-256: 1a957ea5f63753ac3593bb0e25fbe8d4619c5bfe333c38f1174dd3669a99df36

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