Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e7a0c2782ae9bb…

MALICIOUS

PDF

124.6 KB Created: 2021-06-15 21:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1ccc457b9afbdd7b2e870a513a56b11e SHA-1: 1aece9155b4a1ef28eb7860ad9614a604800290c SHA-256: 33e7a0c2782ae9bb692e499917621bf88ceeec01ad43359fabb937e6e6ac25c0
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 0.9994

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://irlanc.ru/uplcv?utm_term=old+bengali+serial PDF link annotation
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/7515056263.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/80637695029.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/28149636424.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff3037726---pubowewaza.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/34030767b4b9af6c756b31fb71f690b7/supaj.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/81b3bd0282db092900136bfab4293531/lijifebasukosubezelovaja.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786fcdb7559---78675235136.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6757b55e0c---virixelipogen.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fcdd70ecabe3f55e831b17f240a6d63d/6235846947.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503144410564342.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/92615077913.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/domadilix.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9uh6v0d1k35qvrvrccpuuun628/53858735873.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/wewefamejutobejasuxak.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed0d9a0d7---94924455560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17676 5160 bytes
SHA-256: cce26978e123d180f7411f8ed456cc24bb8f5ac1d78b11d26e3de0ae2ea7ea53
font_01_sfnt_off00018803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18803 11824 bytes
SHA-256: a339acdf5e03a64b9786076c85675234c11c847e8353b8afa4f78bf6362b8eba
font_02_sfnt_off0001b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B034 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_03_sfnt_off0001c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4DA 8868 bytes
SHA-256: 1f81357c0278a8d272399b19c544df43a6d902ac2177ec359797afe10a941543