Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4393029bc30916…

MALICIOUS

PDF

84.3 KB Created: 2021-08-26 14:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d37e0e6bbff2c1253eeaa497bf9694d SHA-1: 65a1722cae5ea9bf80cf6011921266d45e0d44ac SHA-256: 2a4393029bc30916ec2523ccec498afabafcdeb77b5e3226c1219bad332ad265
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the link farm nature of the PDF is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://wastran.ru/uplcv?utm_term=percy+and+annabeth+sea+of+monsters PDF link annotation
    • http://kmbb.at/userfiles/file/87498497156.pdfIn PDF document text
    • http://schokozentrale.de/idata/16036835273.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca520db3cd---80818895256.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa521c72e---lutuj.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/tadexotiganefilomuge.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/16215384496.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7196dae04---niperonubulutiwiv.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/96712143749.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/lavafowo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/364ccfb7c7a19a5b6fe2eb37b0004cf6/xubeximos.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e5011f6e3---13228741448.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d4cab9b4---97134853781.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/xutakokijazox.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/guzesido.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16107e7e380c33---37317598482.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e7631928---nulipinakapigukile.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/63872977268.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/pototejikatitedivo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/40727444946.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/5658430917.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/kosun.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/puwutetatabu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1dd47232---dupogarabolapijorufo.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10856 bytes
SHA-256: aaf6e405064319502a00b23e4a958383b5a588d37421cc7d976814499b8abb6b
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16444 bytes
SHA-256: 49a39ede5145cb74d58c7d116484e0defc0abed47d3fcb27e6055439fcb2d019

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