Malicious PDF — malware analysis report

Static analysis result for SHA-256 964ec78479cc818e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 08:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a0adf710ab2b892782db2b60c585226 SHA-1: 531d4534d9eeb0fab70e140ccfcd5907b2bf6a3b SHA-256: 964ec78479cc818e61f7db071a6f3bdb9023b54fe637c4a060fffccf98baef74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate the PDF is part of a link farm hosted on compromised websites, with URLs suggesting a 'downloader' lure. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=super+fast+downloader+apk PDF link annotation
    • http://abwingsjanaf.com/uploads/files/43854523448.pdfIn PDF document text
    • http://yongqingtech.com/d/files/miwijebipulasolozamaj.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/wuxubimorozuj.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/67824448407.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/sufaxodozasikonejawiti.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36652597440.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fenibimo.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/dumugelen.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/3011f22e2f7385f93963e59d1c9983f1.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f42299ec---11776081382.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/kudelapatox.pdfIn PDF document text
    • https://moolans.com/uploads/files/raxidiborewisopata.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/vixanupukimamag.pdfIn PDF document text
    • http://oilspecchem.com/files/lewigakifodudujowenezemi.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/80460847657.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/menerumewepizezukiza.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/jefuxex.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4a10db80---73490082049.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/vumufidegoxabuvij.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/31840136215.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff64977613---32743750152.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c4311197---kaforegegurananelegi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/13376896949.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/3773109165.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 10752 bytes
SHA-256: 6aa83d3e6cd09cf447c735702feaac0d32f37cacd074b2bd497a32005159e72f
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 18824 bytes
SHA-256: bf18e156ab4d0c09f19f58859f51d3b339cc7596bd9077fb792dac5b819b837f
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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