Malicious PDF — malware analysis report

Static analysis result for SHA-256 62133105e6ffa67c…

MALICIOUS

PDF

99.6 KB Created: 2021-09-05 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2445f61af72c7398933b27e48c9459b SHA-1: ce3e72c9633d02d6df0b6e050e63017e2990624f SHA-256: 62133105e6ffa67ca8eb0df10d4cb06166a8fb5f26938247d4d8ef4c51f8c025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/agl4oaak2fav4hhtkbr98la645/82383469425.pdf In PDF document text
    • http://21cedu.com/pds/userfiles/files/63597687354.pdfIn PDF document text
    • http://stroi-sistema.ru/img/65868592824.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tolexirulolul.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/wejopesuxisetitovekoxu.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/suxilejutoduboxatig.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2208d205---27746249221.pdfIn PDF document text
    • http://superpart.com/files/ribubule.pdfIn PDF document text
    • http://hbaoge.com/upload/files/koxafimegowufi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ee860fc94---tafibawumufipirokevanalo.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://myqself.com/upload/files/44596859486.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/71699124881.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a2bb81636bbb24717815a61bd48b2714/32287559416.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607000ae72d6f---90981188547.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/56c07c23382ed6bc5999eefaadf75202/nanikitelimopukubatadus.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/namin.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/67106931501.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/xetugewosigugomoriwinazig.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2122226b1---fofepekod.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed7d0d5f3---ditoxo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d9fa0523---4950302742.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02aa9324e---62484831726.pdfIn PDF document text
    • http://allycatering.com/userfiles/68241493751.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/34098448404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=credit+risk+analytics+the+r+companion+pdf+downloadPDF 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://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_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 11208 bytes
SHA-256: 395d4d7af1f8ccd52b7b22b0510f54b1d34cd4edb90ebfa101541409034e5db3
font_01_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 22128 bytes
SHA-256: 4bb4157d08c75600429df92e27d13c0f77ba5079aabf8bcfb55af68a44d87d5d
font_02_sfnt_off0001686e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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