Malicious PDF — malware analysis report

Static analysis result for SHA-256 196c988a67554ccf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 17:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03dcd215647e027a10c12bdd59aa335d SHA-1: a8ee9449b85c479d2e0d83d73bbae99f92037cda SHA-256: 196c988a67554ccfc06451c8137f7fb69a624744695b639b88434e812de09a82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=insufficient+space+on+android+tablet PDF link annotation
    • https://billard-hauri.ch/userfiles/file/13816633055.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/82359246042.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/dumelejorideni.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d370b2355f788e237595a39eee4726a0/50370979015.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/worus.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/i47si5tqcqallsdo5reerpr2ah/badarefutujuv.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137347f53988---31239864328.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/78435130135.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/56478723463.pdfIn PDF document text
    • http://lecostationery.com/files/file/1415103295.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/97151287685.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/70435648094.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/me43m9r99e9dl4a7smarprh385/81000295133.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/55846939920.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lipunelotumuxuzeziloti.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/2217117219.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/nanoneripixoroduno.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210910190536.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tojumanavaxifofekixo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75a8912eb---loritoku.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/86654494760.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10804 bytes
SHA-256: 50da745a9bd86d30cfcd724aefcf549d7b8f45c934c1eeb3b5b2343edf82b97b
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 18060 bytes
SHA-256: 2bbd2130acf9865db70e9a5816be9009a166cdcfbe0bfa6eed0e29336336cde8

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