Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa1cc8131369fe1…

MALICIOUS

PDF

73.7 KB Created: 2021-06-15 19:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2276837ce25f0ec622f312ed255f972d SHA-1: f98545434fca1c76ad506761809ee71915de12b9 SHA-256: 1fa1cc8131369fe1c37a3d081718c3553760b6af0ac01bc5d0c147f7c90b093d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to various websites, likely for SEO poisoning or to host malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, contains keywords related to software downloads, suggesting a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nomylo.ru/uplcv?utm_term=garry%2527s+mod+free+download+windows+7 PDF link annotation
    • http://meandnetworking.com/ckfinder/userfiles/files/42274690495.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f7623cd6afc43b7daa41318baf5eb2f4/84421294671.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/163265d691127f031fecd9e9ad05f477/41505710920.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/gewew.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746cfc1c17---javibuzolu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4e3286657aafa40802da3658b3b4084/78902366568.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bbeee6ae929095a7e264d7bfb6ecf014/64097614676.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e79d68200452a136920da873da62392f/kinokap.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//5889310994.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0eba7a0c---bugiwose.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200860f3f7---40840080467.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/raserojodatixazaru.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014083c834---suzesedomanufixojoli.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/981e3562c59fe65793cdf84761db680a/81106476294.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5392 bytes
SHA-256: b36d0e88dc2216ccd2e6ea136e5d8548933ee828f2b4cee7622b7d6267f27f98
font_01_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 10076 bytes
SHA-256: b338068fbc743dd6cdd8841de66dbd095ec4ae60c9d3f0fca6fe3f173f7b3fa0