Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b1dd270b43a98d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 15:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3436576fa11e3fbaf994c8e93dfa72fa SHA-1: 6510604efe7636da75db7dd74257ca5788fdfc5e SHA-256: b0b1dd270b43a98dcc350480dcdf20703d103bf8647d83a0f05972851662de31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing a trojanized PDF. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

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 http://mingzhicc.com/userfiles/files/momafikuxobebifamefadeze.pdf In PDF document text
    • http://snft.ro/media/file/74614150047.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/zisutelenaripepilemetiv.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f832bc9f9---zezaxivetomatizafifatoj.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fuzumofosozituk.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/47443342278.pdfIn PDF document text
    • http://mlead.net/images/e/file/gerijubomoruginigim.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d31cb621---vopesa.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/bejejisa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f1300bf39c26bd453351a4e377e6c40d/gokegexoda.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/karanegakurofoji.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jezipikokodefekawivolukow.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/tozop.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/lotapesukajuniwoxun.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e7313d91a6647248e4d22c65b14df0da/21043462791.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/54493395852.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1229747017612f16368d535.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137675414cec---46157230703.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/88457364545.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/64907218265.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/labonafabudexox.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/mabijafi.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/31049277980.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/gugojajifazuji.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nazalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=blocklauncher+apk+downloadPDF 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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10584 bytes
SHA-256: aeec8ff374fcc0a24c04c28dde8b0953368b94091bb3305f6dfcaffe80385aeb
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 17992 bytes
SHA-256: 1b6405f12ece95fd1468fe4f0121fbc9caf82733eaf2c8dc6b3d9078f84890b5

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