Malicious PDF — malware analysis report

Static analysis result for SHA-256 3980080e27e317c2…

MALICIOUS

PDF

82.2 KB Created: 2021-08-24 02:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a0b907fe1f963e23fe6ca0c92fa0f78 SHA-1: a6e45ae53654ab503047e72128a7e286fe706bd8 SHA-256: 3980080e27e317c28b641562fb0999942ad2b604635b2ab9ecc2c4f28459a479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files hosted on compromised websites. This structure is characteristic of a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/aivas4hblkigf56dumvkcdt8ol/80684374590.pdf In PDF document text
    • http://hzjksj.com/images/upload/File/subegipepad.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/turezoxogefugezezexivupe.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/karosijarunutamanuruzob.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db8ea0a4c---xulab.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/dimeredavumekemapidenip.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/54f151bc9333b18a9ce32cda6e8d8873/82877214999.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/saxurusipujoperazopuzim.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/52194839750.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/wimenam.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c6da0f7e---35345539381.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/pilujojefumenaxusol.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lisugatunixezu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507030353_1750281936.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d102c9f8---jewef.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d5724075---20383275798.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xujubetabefekuvaju.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/musimozumuja.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bd4c5c9c7---vovuju.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/19daf60186ebb1b656dc42265308191b/geperogunamawifoseneluj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/va417ebkrs70g5j0eir7ptghb6/47147724883.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608242e8f25aa---legofuwigenemenulog.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/wekemumusesudaladapebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mary+reilly+occupational+therapyPDF 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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 17016 bytes
SHA-256: cca857b1c014bd6bfdfb8f15cb0f87eb6ecd5f27aa244394ffea730c13b0b1a7
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10512 bytes
SHA-256: 455334d505eeb36f4f894c7a318139c73e731f32de9e63a76330946e56fb2501

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