Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7444838d1125290…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 23:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd9a94e3b90b9b648f3b5fa06f99c6c2 SHA-1: 4a4eb151bf30307d3124ee739048816129bf5482 SHA-256: c7444838d1125290bf2db07825ec6ab16b3444dc8e1bf06b5eba483c4819ec20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://ubytovna-krumlov.cz/userfiles/file/dilibisulire.pdf In PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/88481609007.pdfIn PDF document text
    • https://maria-galland.ru/files/file/gakomiwupilajojapi.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jotivokadomojoxokupo.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/nuzeranibaxosupik.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/gogepazelim.pdfIn PDF document text
    • https://ka-base.no/images_students/files/27615239530.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f55ab95f---84605807098.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/56026197512.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/disosigogow.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/tovipizodikogo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/90745623005.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/27288811441.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c14ed00b---vukopaseminiwovilabojiko.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/bebifori.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/muximusipexigonoxu.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45688277967.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wowuko.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nunuvutigufefudet.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/gunixogutinidejepipos.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/84116891144.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/85516248994.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/vodosa.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/15615609226.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kq1nr5np58jfrok6fas3e8bbq0/tokifitelugavijidafimu.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/gitawirazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=surya+namaskar+prayer+in+kannadaPDF 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_off0000b243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB243 17460 bytes
SHA-256: a932c537e174d3c00dd0657dd80b7aa4005ef6c79ac2f0e4c15547511953db87
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10668 bytes
SHA-256: 0fd1069a0163c7efe2310002e26c2e303bc1fbb1248d67ab22b89e7d4b2d0e55
font_02_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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