Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a01cbfccd54727…

MALICIOUS

PDF

75.3 KB Created: 2021-06-24 08:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9400e5ecf319bb4b186002d286fe7739 SHA-1: 5977e4b7103e688ada189db89f8543d220b89f8b SHA-256: 45a01cbfccd547271078703210bc8fa41a58a958df033e7b371add10d23b2afe
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a041c46011e---witijarineja.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ivvdd114adokgmk8pcigauc791/40422578950.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca2c74e51---64731184211.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/48809261502.pdfIn PDF document text
    • http://psfund.org/public/uploads/files/cms_files/26221872901.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/dofaxadekexezidalud.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kififefir.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/59350402407.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tisikikodu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/semugisuwumipaf.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76598548514.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072db3d59b53---43682103655.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fawekoz.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/numakebe.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2cfhoq196o17kvf1sgovrr5rf7/movujuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=atlas+copco+ga+90+vsd+manual+pdfPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 5728 bytes
SHA-256: ca3adc04b8f6a4a158e8f6b96a72bb7b75a43a14748327947665de368c25cd60
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 12564 bytes
SHA-256: 7417a5cf45bc4de13f42fadd9102483e8fd3b12fa1e5aee8d5dee8f81c3dbe72

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