Malicious PDF — malware analysis report

Static analysis result for SHA-256 e112fafd54f6a95a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 12:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 069b2fd6724de454706f238853bfb99c SHA-1: 2b62a9601d1e61a2535ce4b2003bd9f696fe2e7f SHA-256: e112fafd54f6a95a07f641ee8e679481558bf1243c4896edcc51fc4ef0c64498
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ooobelkom.ru/ckfinder/userfiles/files/bemovabuxuvas.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7930f3d164c5fec20c057ef5a56f498c/gekuxofa.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/lepuxuvibububulat.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/76190482055.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66ecf5f8b4---88702284726.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/30174755153.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160745287d62ec---wukipuxugiparazemovuwobo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c8b106076---lixevikotabadazoge.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/73824638507.pdfIn PDF document text
    • http://maksimetall.ru/files/17053271001.pdfIn PDF document text
    • https://daismene.it/file/tarulepix.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/64672042560.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/gekexaruratidefewategefad.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/59646246925.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/f8srmdr59gvn5b8rjjo5g5gtdn/rapevavozabasonobujemufu.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/71098480056.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/29248764715.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lqrq41ebo06u1f9bu4mf5ogl2/nedapimefegukamufag.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/dakojulojifizeko.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160792e107eda8---44070314946.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/safurururadegurezemuv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q3pi6s4hjfci3smam5jtcoem39/15651747477.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/gutulawoputagemoluzered.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=intelligent+business+beginner+pdfPDF 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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 10584 bytes
SHA-256: 2731253967d81246987f8c9022594f803f47a89b0680e46d70690efef8ecb598
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16872 bytes
SHA-256: 056692ffb956985666597ee0b025b2b3d96ceef30a983caac2aa8dda2c61f2d9