Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87627792819296…

MALICIOUS

PDF

187.2 KB Created: 2021-06-20 05:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0751db777f580556a46e7da660984c26 SHA-1: 9914c9cd3f45672a58ad3ccd6a9f433feaedad72 SHA-256: fe876277928192960aa3c68c32a5ef1cc01d2c26ea66ef2fe0a9b2849696e1a7
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 0.9990

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b210c023b5---lujavasobonobajutewuropa.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9c292720---85247170589.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n54vi39bnr3f42lm9emkk7vfv3/88276497604.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6716ef619109b0bc3737641229880045/rinuji.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946611cf69c---fuvegomedosufatatipix.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3d8ac7aee76522f7efe981b2793fdbf5/44169339891.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/fawirasevivi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082636fa347e---28726873781.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085665005de8---laxajeradejesoki.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7526ef8c---11536611306.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8qourf0m7decm3n44od0sofahh/xusibojotekebubewofejitex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7eaadf0e5abbfa8bc0e3dc0463e9801f/xolunigolugiwujo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608034838aeca---85181205199.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/19696059576.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/toruji.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
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=batman+vs+superman+isaidubPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000280a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280A2 5324 bytes
SHA-256: f232c5b72a3aafb09e851b2238d9e617a534b42ebbd17f2ae640a25aa6168f2a
font_01_sfnt_off000292a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292A0 13708 bytes
SHA-256: e3ed29646f08f4ccc21a86b6043e9f3e07456af2b9c9160efa74dc7d8125b779
font_02_sfnt_off0002b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B391 12840 bytes
SHA-256: 53fe18868850b106d148be8e9237810b1fbbb29508d9cf58f5bb8c1924863eb3