Malicious PDF — malware analysis report

Static analysis result for SHA-256 552fe5b088d9cefb…

MALICIOUS

PDF

81.8 KB Created: 2021-08-03 15:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85122f0f6a20fe2cc9cf63daae87cda9 SHA-1: 86fbb7ac1046c1607a01fc14194d99f0cc5b71da SHA-256: 552fe5b088d9cefb9bd85124521886ffe8155700cb1426917f3e5644b561965c
196 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or extension. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve as download locations for the secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=how+to+delete+multiple+chats+on+messenger+on+android PDF link annotation
    • http://quaretti.it/userfiles/files/dixafibugadef.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/57452401989.pdfIn PDF document text
    • http://veribase.com/E/file/gifowifuvapulabo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c41a801b39b9b44ffe7368a2ca6e9350/ladukewuxu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37758743869.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6c21ba459f71250f4050de198638eec3/bakukexase.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/49438615978.pdfIn PDF document text
    • http://gistys.com/userfiles/file/24199894946.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5208341975---vukovevex.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xorozefitobevekefiziloka.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/12302945678.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/31432624524.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/c53fee5218228bf3b3877f1a572cc9d1/52416559297.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b742b4a3f3---wakep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5e782bc2---51943127983.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e600029801---fuxesixemezoriwe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/95055409794.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u5mm4j6c83ucja28b9oqs3scp9/zukigufel.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2973ba738a2994a789010ae15a62ca61/58872283839.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9747648722---79789619146.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/2330324055.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16768 bytes
SHA-256: f1ed3c1beb7fdc7793a97284ed4740057d737311be589f927403ceb3f20396ef
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 11140 bytes
SHA-256: 7773e1237aafba2ca529d6773c955b37b8b09b336f7d033febe89e9edd13ffd5

Open this report in the interactive analyzer, or submit your own file for analysis.