Malicious PDF — malware analysis report

Static analysis result for SHA-256 819d9f25a730c692…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 14:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b238fecdc837d66cd6c6dd3da7ba8a5 SHA-1: 5c31d8fa14b8f844e02dac1d8c3a90cb218ba097 SHA-256: 819d9f25a730c692e49c25a52b333dcc7049ac474bd2989bb8743c9b2ebd1277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://catamma.ru/uplcv?utm_term=huesos+del+pie+anatomia+pdf PDF link annotation
    • http://vvk-wiedermann.at/userfiles/file/30730806332.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1f322d2f2110012fe076901bf18334e8/pubagemiz.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b39118167be64295a91ff0f16c042ac/dukapomapiwibif.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/7456362264.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xakobedute.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kapoxe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c841ae1930---69642119725.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nedewemevug.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f47f7d5e05f---jukuvovunaraxus.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93109434573.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/76430587253.pdfIn PDF document text
    • http://kasargod.net/uploads/file/15489349642.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7635a4d05be607bdf2f64dbc2f09375/53504268265.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e629eb7af4ea9dc68c2fcda7b237abdf/22675495835.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d09i9uvdvjip7jrpqpeclh4f5c/39307718370.pdfIn PDF document text
    • https://domilot.com/uploader/files/purilubejugesaf.pdfIn PDF document text
    • http://falerisztika.hu/tmp/xipiditegajoxipagad.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/761434f5ae6bf3f76714d83fb9bed9c8/dipinu.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/58033733881.pdfIn PDF document text
    • http://remobudostol.pl/pliki/53336987381.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/36723327694.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/87b58ad5073f74a7df68d767e085477d/lojasomigasuxajebu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80559a34c7---24213221049.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/gobikoruditivon.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074273be1a1b---29412036700.pdfIn PDF document text
    • https://csn-alliance.com/data/files/32421987675.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10652 bytes
SHA-256: 7c4c7c984e021c431ad94ace7225a93a5ac088ad392a2eb9a71f58e299b5287b
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 17832 bytes
SHA-256: c0cece5f2d96812ea6693f7492557dcf00bf2f997ba24086aaabad4237e3e468

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