Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a80ced95119015…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 09:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff25feda49a258fb0f82fb7582b601f3 SHA-1: 653756b1d317a1f0ac6a7ec819e5a7dcc3a869db SHA-256: 09a80ced95119015f9ddd44fdfb3eaa3c1606bd42f89f5ac67bd66214b283cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including those pointing to compromised CMS uploads and disposable hosting, suggests it functions as a link farm. This is likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.kotolantopeni.cz/files/12191343667.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/70079296994.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ahfqen9ice1aamemo8jskeoqu3/napasuxuregegivaz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc923a283---65722181001.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/8975241805.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xavipenutugezikesudam.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/69248080343.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/3437152941.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/64624143097.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wabiguwekefegak.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/vodurozoto.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/jezakosewatu.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/75241438222.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/musepadafibufegumijes.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurogadogajawa.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/32961508964.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/93797825645.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fitugijepejiteru.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/vutabilaz.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1fedv98u1qjbun983rklo76va2/91611400628.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/gasalimivirepivudoji.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae8d5f1d6---93986460879.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/febovisegatij.pdfIn PDF document text
    • https://dukupahit.com/contents/files/bokijumugobuperadar.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37992083309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=8+hole+carnatic+flute+finger+chart+pdfPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 19980 bytes
SHA-256: aa0961dc0563b365a85f73e17e49811e9cbdfbd16710e9fb1267dd14c6496ac9
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 10944 bytes
SHA-256: 543d85e7c32c88761e918fb37c2be2c88af5e5afaf8b76049b94d68bac526c8a

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