Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7c16eed6b34378…

MALICIOUS

PDF

90.2 KB Created: 2021-09-16 16:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58d26ae5a9fd232715a7f8ada83a7da1 SHA-1: 5fdc0b143dc1ec09edd2d60474f4938989dedf9e SHA-256: fb7c16eed6b343788a592fc00802dae4fe52db8efb4d3d27667bed1e73905a01
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a browser extension or update. The presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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
  • 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://philabc.ru/uplcv?utm_term=download+plants+vs+zombies+3+apk PDF link annotation
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/69632756241.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wulebepadotebakiwalenedi.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/doxuderutetejaxatadu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/15478603501.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wikomumimo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e68e5a9be---58632938795.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/69587507777.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/55378229143.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006e0e7215---vowinenixewujelujepa.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/zawuwawiv.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/11030652148.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93822966526.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/lubifixu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/18168627533.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/22364151017.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nadukav.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1159b486b967276cede0b0f38dd81a32/81225108939.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gezexafixaxovekubepulo.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/bepujudomokibuguvekize.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/susuzajoribizu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 11072 bytes
SHA-256: c4e3dd5ee43bbec324f10e8fdae9a0cbad1f1555fd15466bf0833fa308132efc
font_03_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 23572 bytes
SHA-256: 2da74bdccac9c457e8d55686cf7c9346c9d0867ef16464e0d00751212d26b4cb
font_04_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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