Malicious PDF — malware analysis report

Static analysis result for SHA-256 51298f85ed1ff154…

MALICIOUS

PDF

89.9 KB Created: 2021-09-14 12:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78f16209df8d1243543ce1acb0dd2e8f SHA-1: 526dbd759a0bc34e6f447d48455af9143aebd0ae SHA-256: 51298f85ed1ff1547d775dacc10465f20f4eff4decbe9dc0d40c9cf21459ddc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Several heuristics indicate the PDF is designed as a link farm, with some links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=inferno+dante+alighieri+pdf PDF link annotation
    • http://nanouklid.cz/upload/file/884019844.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/32276078031.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zototesizujosenatozup.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/kodidokomuginapabopujugo.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/bejegeramogadux.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/resujilif.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tirivufelakata.pdfIn PDF document text
    • http://klinok-saintp.ru/files/29261209410.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7709df94---56697421636.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wumowuvutuli.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399a0ed6de1---noxokifejasolaza.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e2c6b0f267488557d5df7e563b6aba90/96119741877.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/jodafifojabozegowugajoxo.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/29943440268.pdfIn PDF document text
    • http://rilta.net/userfiles/files/pigatuj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/11o3h2qkj7m7m2q5caaea8vqgj/zazekopaboseboruzuw.pdfIn PDF document text
    • http://konberdbio.com/upload/files/15586219691.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/18560745222.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/bejiluxapuxosufejaroxosip.pdfIn PDF document text
    • https://noventa.cz/media/files/file/39467593563.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/karirag.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/dilajulekemis.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/3333df.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 17688 bytes
SHA-256: 510d9e06b27adf278aebd56cc3e0acd4ec7e40b6ce98010411641e3df24d0f97
font_01_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14275 10560 bytes
SHA-256: b79be91cf6c103cc0817fe608e000e9f4f826ab0241b68e47762e972c0eec5da

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