Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba8d9bd756bfa7a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 22:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5c96ff601a406955fe25d36bc77e86c SHA-1: 4651dfb4be672b2eb52a6319cdbe5c2aea181228 SHA-256: 2ba8d9bd756bfa7aa79139468f55cee3a0da7ea2c9bbafda0e50786ab4362e67
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates that the document attempts to trick the user into installing a fake browser extension or update. The embedded JavaScript likely facilitates this by either directly presenting the lure or by downloading additional malicious content from one of the numerous external URLs found in the document. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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://coretry.ru/uplcv?utm_term=login+page+android+studio PDF link annotation
    • http://orsini-blasioli.it/userfiles/files/45045276479.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/varozodujokas.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/92311391207.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/56230832352.pdfIn PDF document text
    • https://upaspor.com/resimler/files/50987459936.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/depidimazekeju.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/79720414013.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0343d3481---buravuvufek.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/83093884550.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/lusilepozefuditot.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135c484c04a8---49653586626.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/fesilitugejiregefetiwodu.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/8639631436.pdfIn PDF document text
    • https://rinducm1.com/contents/files/werivamibiguredazixe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134d5d5b1bb8---neneragozawovabitajuvapev.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/95105716792.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/vinaxelosiras.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/tekafudi.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/1123352174.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/fudakezesubodiravobuxe.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/bepakitiziko.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zoxoposokewiv.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/74809073878.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134de8b94b20---guwexetezaridukefewep.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_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 10576 bytes
SHA-256: 0ae4cd5b9ed233694549eade88bb2816367c5541a832d9b03b24f7647149b7f1
font_01_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 15412 bytes
SHA-256: cd4a4afddd9189ca9c3c3e2f6d140d5a04fc01bf3b4c08032ba43e4343a39ad3

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