Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30a9c0ac91e3a44…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 11:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1233c920cf30c506fd9668bff070d0b SHA-1: 4505c767ef8cf5f0d2ea44a8651d884891b008d4 SHA-256: f30a9c0ac91e3a445d56d6f1539d2117d88e1b3e8266546c9f856aabcf22d392
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=worksheets+maker+for+teachers PDF link annotation
    • https://rt-totaalafbouw.nl/userfiles/file/nadufobinasidi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/66om6ichp4fjgmu11mclksu68a/3686665470.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/629397b1b617c9921fa3b3b1b38570ea/22974675406.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/18ec29721b49782157002c95df99a23b/942566005.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/safikixivipufu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/48469123288.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/jubivilen.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1f8dcd83---rufumumiki.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/26690023020.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/pujomezuporujidezow.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7fbb321a923198d4ca167b35ad8ff2a6/pumovas.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/86435275746.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608262c78ac38---mosewalale.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/morozugigija.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cda976fb468f3039d4405b2a36dabae6/25663001576.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/puvupisi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-25/20210525042734430020.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/komisezasibidomidemak.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kifafinoxulupivosepafob.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/45904930762.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2k0c3k54f810bauou6j55e6e6/rixutatoketadujamunodave.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/63076285832.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd902c6c391---83300551990.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 17972 bytes
SHA-256: 3a25d52265dd1b14df0703beb44c77b6b2fb423aa2b2deb0a8c6bd80c7d186d9
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 10444 bytes
SHA-256: 5ee801e3d69f2dfd403694925585592ef7754b3e7d1ccc5cebcb1a225598e001

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