Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c73d442fecfdcf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9e34357e526f150aeff22adbff3a6a5 SHA-1: 2b7199d9d0ef468041d7046c7af4be16e5b7df10 SHA-256: 65c73d442fecfdcf2530b5bc02de95860ce63c5df10e3828e0e31cc9c5e392a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading additional payloads or executing phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://copy2d.com/ftp/image/file/wefadelojavedajagoru.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82a77cebe89ee615302c911337a91209/15058379288.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991fd83ec---93173312731.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c4a6cb895459c7904ac770b0f7c4d7bb/rakefugoj.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5ead6b23ddc669f887982eb24df53032/zimurotejijud.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/xefikugikebegopusebowatop.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/lixubididimilelama.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16745983463.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5be38a18e5---pagafobezalakeleno.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/22294346653.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/13225184117.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/18565885500.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/nasanobuno.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b1e4db163f9531cca3e1048f5bd79ed6/67198253890.pdfIn PDF document text
    • http://nineslash.com/user_file/file/42386096294.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/9323286014.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vuxotelilubob.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/19kje5129r2omjr9upl2ekmet3/sakajumusebirisode.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/befajid.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/kezusenavekedadila.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/gezitago.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/162395174672644264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=exercise+on+adjectives+for+class+8PDF 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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 18020 bytes
SHA-256: 3cf07d68f8dc1e77a81bc31ea12083664800d96200444f91d451a27d9faec9f7
font_01_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 10956 bytes
SHA-256: 72638ee0de592f426e9f2d7226458e29eef8dd9bddc182d58b7bde009807b9da

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