Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec047c78be3d6108…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 11:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f65fe700a69867c3d9547c54158e171b SHA-1: bc38b4ef4e2ee9ffe136e1921c7c652b77c57671 SHA-256: ec047c78be3d6108641e32a2ee97357926b40baa78fe3f76c10f19a122959d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://imhkayseri.com/resimler/files/41681145039.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bbccae709009975a6181e6542eb12840/59211284026.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2be37341---74314200763.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/65286774736.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9oiuu2h2cdt094lmethc9er23p/96599406366.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d768c719e2dcc01088c46eef5ff3b5e4/94166657208.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/10628538871.pdfIn PDF document text
    • https://ccskin.com/geektic/files/misike.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vf6ume6gv3u8pb4ecrfo155b6s/zunojiba.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/tosulu.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/74020302093.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/66235792876.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/85651942058.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/98711889123.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kis967jjim3mt4vorr9ejgfglh/fizata.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/90307102395.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/dosunufumobijif.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/78734006637.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/60864709547.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/zelunubataned.pdfIn PDF document text
    • https://goodline.by/userfiles/file/lobajelunokotarukebo.pdfIn PDF document text
    • http://alptw.com/images/files/berumaluxasuxufevelalibi.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/xafojiremifes.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/19812566023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fuse+pdf+filesPDF 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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18924 bytes
SHA-256: ce845e9cfec17c71bf2f67130b7fb529d8ccdeb3d1b5d84548c26f8e8fddb5a2
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 9984 bytes
SHA-256: 3a2f19983fcb85806975af7bdc3df98032d078749281479e8a9998c91d606bdf
font_02_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1