Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea07978096dff909…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 351276d5d0b7e28993ea43dc27de87b2 SHA-1: 63bbef9c112c931ccd1eb082c5a2ab6c54152878 SHA-256: ea07978096dff909d3ee45be6bdbfcddcd3110f0ea225f9f6f3e926cb6f97548
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attack aimed at tricking the user into installing malicious software by pretending to be a necessary update or plugin. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further support this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://www.jakketoes.be/ckfinder/userfiles/files/32258723783.pdf In PDF document text
    • https://rubfila.in/files/file/48687631962.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161442e85cd56b---zutosadutijofuwixa.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/jomumirez.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/letelexerupanesuxaxoxob.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc657ca56---13395163589.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nigegisemime.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/nukegobomi.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62286876455.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/kivelodanebededal.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/20931815759.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/28761966147.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/21pt0vvuq93i9pqoamloe5djvv/vunajod.pdfIn PDF document text
    • http://philipsphotographystudio.com/savujemukekudafogaj.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/58939409943.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/lomovizexox.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/tijowileworobizak.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fumotabusabidi.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/91398667527.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakifujarubagadiwiz.pdfIn PDF document text
    • http://goldia.cz/data/file/tojubesavelo.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/pomuribuk.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/wugisuwetavewuvorowa.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/demodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vpn+hotspot+%26+proxy+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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 19896 bytes
SHA-256: 5a7de12799c7f49b86f9933e119d84616cffe88f93e0cdf6564498ff08145ba2
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 9784 bytes
SHA-256: e812daded5f2cd3318b0af8666b7e487ddf1702614980a4b18ba7c733403fd2a
font_02_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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