Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aff812585ee32eb…

MALICIOUS

PDF

85.5 KB Created: 2021-07-31 11:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc8fbbe289c6feb087e5a0a090496bdd SHA-1: e95565bc49509cc0bd3b22e2380ab54535702f9f SHA-256: 4aff812585ee32eb39613076700644e07610768486f1ed3646709eb109513e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=diablo+2+pluggy+mod+1.14+d PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45adf86fe191a354c8a8121e84c6ec15/tawitofudanezodelidojur.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/rixoverawezusajaxow.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/xakunopuwigezu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/gipupokerigenapipe.pdfIn PDF document text
    • http://praguetransfer.com/files/file/50857822111.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4859dfac782d1d17b41aac1629e50687/jefiwetonedapoxat.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea434d07f---zodokulenugamuji.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzosesuvoxujufuni.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dbc7f994---sexapapowew.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38cc30ab70---71940369423.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/90263490636.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wufogejasafovom.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/71918398581.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8704f38766de308e7ced2c2210471195/85886402424.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gubozefelotituteritob.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079853554e9c---37337550535.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fujq1i8tu9577fq0hsfrar42k6/dorivaz.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/dupimedovopajura.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zadozifiriri.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ca34e425c6581bb7004c87f6aadf3d41/16640916234.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/79214807246.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10804 bytes
SHA-256: f312f4ea90ac2c8f68bfbd4d862c6903502f58fe83a222f339357510dbb8630f
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 17760 bytes
SHA-256: 5af3348730dc6a9e8d21ee824d5b3d8d23979258a0a743c0f61bbab0ddbc3523

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