Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d637c320a390860…

MALICIOUS

PDF

98.3 KB Created: 2021-06-19 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09f5bbfe6349f7b313c790ce2fc2b01e SHA-1: 87d604524a5ae0c9b0d99341380a192e448c9e86 SHA-256: 4d637c320a390860115ef5852cbb5551690774acea0cb4d9dd259f028da530a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=sankashtahara+ganapathi+stotram+in+kannada+pdf PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/panawodigatulixifu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c5d29fda---76092220172.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ns6n79n5r8r2o14vpfaogidav3/fusako.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kolite.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/37609822103.pdfIn PDF document text
    • http://landia-print.com/pdir/file/88540011264.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/87161490961.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7rdbgmfnjngblm56dlvnq4of3/95162046484.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/70396665626.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/muvilubikuzigatexerera.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/morewibavubizo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/20584462557.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6211697dca---lasovidugikuvugipukasuw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1aeb2cce0---zegavudunokujirun.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f36f0e62---papuzulevo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/zinukikin.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b953c2749---bidinazorikiziru.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011a28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A28 29216 bytes
SHA-256: b0e9e5b8bb4c3801a65c672233fa8772bc7c133853890d93bcbbb656ad4d7a9d
font_00_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 5592 bytes
SHA-256: 049d109e2fa1c6ad52f9b4e18f3200a7b2271199ded914051f4a3b01a56d8008
font_02_sfnt_off0001527f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527F 14228 bytes
SHA-256: c33daba9310ef6468590b4be11cdf700ef75fa4034d0098b30b1df619aac4ead