Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa9592774a5607f…

MALICIOUS

PDF

92.6 KB Created: 2021-06-11 11:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f991820210f60803d40bcf177cbb4d25 SHA-1: a4d441de96aca271ce15a6e07e0c77e1bb2eeab3 SHA-256: 1fa9592774a5607fafbe8804b8af5bfbcc01852b0a4f2d5f68349d9384dcef37
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://oniceh.ru/uplcv?utm_term=sn+mishra+crpc+pdf PDF link annotation
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/niret.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/617ff56cb1da03254393500465341cae/saleneximet.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/javagelevaxoremaxorul.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/nuragidazirutiwebanavaf.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f5d1ad332d5032aadb1a8a7a82d4101e/parirepe.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ct8nv8ih2u2hp6go7oi14p5ad1/pavetelukagokudeluneduk.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e3e7d6a0---78186181552.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0cdd8abb---67320126163.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947441861ec---fodebixesupukok.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd3e43075---58728424683.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dinatituma.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42693230910.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb83ae7e5---zefimubunufuwiliputis.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b028bb1a15---wabedeponugezovesidilamaj.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/8fdaf65a679888645f559f2585968c69/kojazam.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/95185900622.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/fujanotijora.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 5464 bytes
SHA-256: 04a1eb74522ed7efd4c2cbc4f3353b0aaa60c14069a033fd56ac988b9aa106c7
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 13468 bytes
SHA-256: 674bc56753b9239ae58c893254c4643d4eeebd6edc60d9842a4092c2bf4f69ef
font_02_sfnt_off00014e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9F 5928 bytes
SHA-256: 604b231dd2354eb4593543744ebcb693059e57c1ee536790333c7778923d3441