Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dca59c21303ace…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 21:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39d56468731006f6547e0aa5f2d91f70 SHA-1: 2c24773e017128c6c71541cf94264aef5cf7cfd8 SHA-256: 83dca59c21303aced5c1cb67ce4e49c44f3211e38420ce02992e9a3c175b6128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit user trust by luring them to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=i+am+unable+to+download+apps+from+play+store
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6cf9f49f---82796087898.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b2614c5f8a870d59ee4d92a8702e6542/sovufadowe.pdf
    • https://securitydm.com/slicice/file/17266892823.pdf
    • https://dalba.net/other_files/File/niwivanarubulo.pdf
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/59793163498.pdf
    • http://huyndaicaudien.com/upload/files/wipizefo.pdf
    • http://cartopack.be/Images/file/wupizilekonipigiwunapu.pdf
    • https://hometutorsdelhi.com/userfiles/files/gejorukefopuz.pdf
    • http://ykzn8.com/upfiles/editor/files/digosatomominorobo.pdf
    • http://vesimport.ru/userfiles/file/zonubusexewukekokona.pdf
    • https://shellserva.nl/docs/Image/file/92716948794.pdf
    • http://ke-sen.com/userfiles/file/1630508584.pdf
    • http://www.pics4us.de/userfiles/file/dijoruvanomarevew.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/vixajesepelodameve.pdf
    • https://nhahangthanghuong.com/uploads/files/3961508645.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143326b1c07c---nalilerawopidivagitufego.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13467310080.pdf
    • http://matchonusa.com/uploads/files/78800946834.pdf
    • http://cgl.lu/userfiles/files/14502546873.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142a689d6141---wivom.pdf
    • http://sandlnae.com/data/editor/file/38493074304.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebe131909---47009994549.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c1.bin
a37a79fdcd01696a590ce9caf4e20b6414605c52b8d778aec96751321273bf68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 10956 bytes
font_01_sfnt_off0000f103.bin
00f2ca2e4bbd06fd1afdd478d41c3a2833a109797e99cbb03158d2c48d23b4e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 17432 bytes
font_02_sfnt_off00011e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes