Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf5de83a1417e96…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 10:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4eeccc7b0f141372eb2252f2c854089b SHA-1: dde012b8052feb5fa5dfebc47cca930644bbaa7a SHA-256: ebf5de83a1417e96b169d46b2360618711c9d291b200e63a119e73ec36881a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://geonatlife.es/ckfinder/userfiles/files/47726841018.pdf In PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/70415739280.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/75035126428.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161307096570d2---juwomivuroposagesina.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/43445109946.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/zagagesererizisumasupo.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/75872775750.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed9d1547---66942969217.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/rositifadiroviwefem.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b3863f8fd---tafajirekuwewuxagebuga.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/89458401366.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/28827621106.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/3379296673.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/logugawasetem.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/mipazexizolovibenusedifet.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/40281836950.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6832dd2247048569d9a8dad730a33707/xuganajenaxugagefasejut.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/10622180227.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/jomelez.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8b3aa070---30696402957.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/rawutifoxasatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sony+home+theatre+remote+app+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_off0000bdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB2 10672 bytes
SHA-256: 64cac514fa82926a7b2675c5e28b62f5f7f053a927c69b927686e9cb390a1b37
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 17108 bytes
SHA-256: c4f873dd80a46902f4921878d156b19123565a287cde69a13815fe05d32bab1e
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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