Malicious PDF — malware analysis report

Static analysis result for SHA-256 8622be3190a85ce1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 09:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ce76d21245a78f3acf822560047994b SHA-1: ea4e451e73dec616596cb2892b7ba1c6737908de SHA-256: 8622be3190a85ce13be4d8d0c4fc0613a7a5c96f5c6c09616e083a091e8865dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and links to compromised CMS uploads points towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=researching+health+qualitative+quantitative+and+mixed+methods+pdf PDF link annotation
    • http://ndt-tl.ru/upload/file/kivadodomuxisatipuwavobi.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kenufugovomevugeg.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/fezeb.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/79993331859.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797f56a082---95191770223.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7b1191768845fe8d66261ccaf9a76cb5/miramamajimisozo.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724248299fd---metukofiguzavejufozo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42030a4a15---36720465747.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/63318423523.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/lirepubiziguvawumoxawi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/lpineven2pfq13tun4l596o1p3/78529499729.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/laponuloroli.pdfIn PDF document text
    • https://heyratacademy.ir/file/dajafewipix.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637b797f25---31183192599.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/7385064778.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c178f9f8---zinodusujowodezajul.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096a128d2a58---nepolefopozazemelemetuzo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7a02bd5---31712665468.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/lujurupibinal.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/malerinifumotus.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba3c274fd---gelibunemowotapiberu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cac986ae---texufuvupodepo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88fa07f32bf630686209ad4412a37ef9/vowuf.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62a955c12---sofijizofivurun.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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 11524 bytes
SHA-256: e1ba5a29b825cf9c75ed8dd79862883c78323850fb0f93921c37865f56910a3f
font_01_sfnt_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 15032 bytes
SHA-256: c705a46c129807e997d4985f964784ee9d128487fe384faa74b37c05c8df5dac

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