Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c16b335770f6f2c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 22:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 45f73f6bf4271f262b9ed4e63ba194b8 SHA-1: 07d879d809b8cb0212d1bff35c1ee54bb7ecc6a5 SHA-256: 1c16b335770f6f2c72905de5d5a4286f3f8159d6d59ab5366fb5aa984fa94cf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to multiple external URLs hosted on various domains, many of which appear to be compromised WordPress sites. This suggests an attempt to lure users to malicious or compromised sites for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160957fdf9e802---domunarinofexiwilaxof.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ddda674cc1dade9b5f48d8cc036b62e8/zomakume.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/74518092309.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nokuxa.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/60398593776.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608791645bcca---tinuvij.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c9eee8d6---54117865051.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/rudidenu.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/21966328317.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b02a7816---8293299052.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990af569677---8811799089.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vuzokiroserafagibulitazud.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/84935289538.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/megulakamo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/454b723d326fef0b7671e2f45f897d03/65736236122.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/silaweb.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/79a734b64474ad0bfd4092ef955c390d/zimafisaxekobav.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/43993674061.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b431f2e99---wubol.pdfIn PDF document text
    • https://airbays.com/userfiles/file/62165928368.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/vafufotipewafuvawikupiwul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pulse+rate+and+heart+rate+are+samePDF 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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10404 bytes
SHA-256: a320baae6db6efb1c65b962c3067957f7a9d577028c63f8178c0c85e9d710725
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 16712 bytes
SHA-256: 561deed9aaa259f71f55e147adae6ea8891117e16ee4dd56aad56ced834d6ee8

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