Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da6051038ca3242…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 06:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac83077f164ae197667df32953d21a03 SHA-1: cb716d1f70919d65b68ac304ddd5fa0745354107 SHA-256: 6da6051038ca3242c9b572b0ede710572b46caba991f409b79beb958376ffecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS platforms. The presence of 'utm_term=minecraft shaders download apk' suggests a lure to attract users interested in downloading software, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philboyd.com/35473063830.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fdj4ove0e5kkj9hoq0m969f92/pawubovugusamudoraj.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/92610363311.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/61349366502.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613945e3ca1e6---vuwet.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fivufugi.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/towifetatavapogoja.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fff44b5728a545cfcd2948aaea7e0221/93808626749.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/86689606470.pdfIn PDF document text
    • https://nomortiga.com/contents/files/18076110217.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210901_172258.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pimajifuvi.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zegukoxogopelugubu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/58694138609.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/sejarunupopuxikulapi.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/jodumubalalevadegapano.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090821365414.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/12131789491.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/dejewoki.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd830acd747347fa615bf61dddcdad37/66796821952.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jipavode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+shaders+download+apkPDF 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10888 bytes
SHA-256: 3a0ff845df19eabdc711b0c79bef8f3d3ce79febea49cc77961df3db5520eef5
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17864 bytes
SHA-256: fd7307838286b337361a0ca275c778a2fbce7ec775e16d6b051e59e72114bdb9
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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