Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe176ec9c8493f2…

MALICIOUS

PDF

91.9 KB Created: 2021-06-14 13:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d1f86a7db0bd0c6b3e0878e7626fc5d3 SHA-1: d19059d7b13baeedf62f0f0ce910074060ba95d3 SHA-256: cbe176ec9c8493f23a6b82434ba786c4dce3ecd99302f01b0c77ba2ff297d2c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9997

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://krisoc.ru/uplcv?utm_term=streets+of+rage+2+unlockable+characters PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e4ab52e---30858345937.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dojisolu.pdfIn PDF document text
    • http://446888.top/userfiles/file/disafaviputiverepamiw.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pepivadasetawej.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fdnj6im1damdq0ba888dla3sn3/15966716691.pdfIn PDF document text
    • https://clove7.com/userfiles/file/45130622146.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b632b71572113cda5d314237fa78a2d/kinapirizekaragilokun.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/foguvusezapinali.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/fakajasebu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609351711e2b2---87253069440.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/23669334797.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d012dfb1---73919265878.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/wukajaduduposig.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ehl9s4otqm6pgumesqs9t1atn6/21059210859.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/71029663791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 18148 bytes
SHA-256: 8cd1952364dcf85f6c18a1d3f2bff6bf5f9b1cba45cdae2a073525ec0102424b
font_01_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 5580 bytes
SHA-256: b4c8b301a6fda69e78ef7c4a7958de48de15ac310b2fc3db847f316d52425cf7
font_02_sfnt_off0001381a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 12212 bytes
SHA-256: b9958e94d1470fbb17b03c13f4945be20adbfceb43062b0498fd233098596849

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