Malicious PDF — malware analysis report

Static analysis result for SHA-256 318bebf3fe6bb010…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 17:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 436400f29556d48977579ead9b77ce82 SHA-1: b4de59c96b97f5a86136c1913e4e2a049bb241f7 SHA-256: 318bebf3fe6bb010d1c2829a313b45319067efc1cefdc20d030bb102d0313cde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=watch+avatar+2+full+movie PDF link annotation
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/61545728301.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fonujofemomotilizege.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/sosifozawetimipawa.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210920174540.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090411115473499.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/9814997616.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/sosomegezetomoxilu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c624d853ac---48359380089.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/57505325053.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/navoliromarataxe.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/92647558577.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/kaporonilapujuzajezed.pdfIn PDF document text
    • https://krusomying.com/data/file/paresunokelu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cc355eff1ecae48d8d606268cf88cac6/siviloxeretubujukekoxuvod.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/rebidejovikemopibepikiwuf.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/menemuruwakunedanaxasofo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2884e6792d3a3880eaae6b6e9f710b78/bipururamedagaloji.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/lalokagixorifimed.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/mejoparidogujumuf.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/57181103573.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/kujafotuzageduxagoxemof.pdfIn PDF document text
    • http://hainfelderteich.at/zijetokitegofijudenesa.pdfIn PDF document text
    • http://contelex.it/userfiles/files/xugifodunomu.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/semolora.pdfIn PDF document text
    • https://moolans.com/uploads/files/buvuwagewofojaxa.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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 14548 bytes
SHA-256: 5a162019ee5097782c00a359aecbf6b31bc4c9944335c517f591733c8702c650
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10608 bytes
SHA-256: 37f364122c810eb7ddb2c75d6f9230a9be25dcb2769b0452fa7d7e4fc6fa4d78
font_02_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1