Malicious PDF — malware analysis report

Static analysis result for SHA-256 774d9c354de2dae9…

MALICIOUS

PDF

88.7 KB Created: 2021-08-05 14:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d9d28980c8fab3a210db5665e0607be SHA-1: f9abd6b6eb2ccca4c48ab751c0592e1b210deccf SHA-256: 774d9c354de2dae9785945cc3e6391e703e1de4fc52b97d565e00d0c83bbc481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=skin+changer+fortnite+download+2021 PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18365b22b---61211823284.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/lujevulubu.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097b8e6f18---10318229346.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/regubuxavazinul.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7356a393f6ebf6b8d41a2e0b48ab0ddd/kutativalomudujotikopoji.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210705114338.pdfIn PDF document text
    • https://webmenuplus.com/images/file/31287828537.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/33088422411.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3mb0lgfb0r8in0b803rojtngp8/26060937566.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/90803655012.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9i485uec0mvqko5jgappgnd9h7/11243623297.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/vofogilujopodik.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/12053750013.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/fubudakadomijunebedosal.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/57f44b6bd52bafb43513946c94667936/vovepe.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/dba8f4dcda8cadba4713a12ed06bfd48/lebabawinavitubopi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608874d34a9be---busanuzebadifuragikafe.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/63717657206.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/tarojigidalejixilugab.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/46827199350.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/210q5mp2i5f15b7lejlafp47ud/vojofikixikok.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nopamasaxuxibovefukax.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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 18108 bytes
SHA-256: 130b1eb5c65bf65fe9c275b4847420d1dc5ff90d06482b656276aa9452f39411
font_01_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6A 11132 bytes
SHA-256: 44ec717ee44bcb36ddc737082f1a9e520e16a639f0fce0467e483597f2f9d698

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