Malicious PDF — malware analysis report

Static analysis result for SHA-256 935e5d4ba57c0fbc…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 01:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 199d59c9ed0cdc47eb5c60abb6cd6d6a SHA-1: a02ef2842e77cb67b0b8ecaa1776b6342ffffc03 SHA-256: 935e5d4ba57c0fbc2dab949f8120aecea1ab914f1c4f34f40a02dee0df1f8c83
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2e15ea30---gutuvub.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec506e3b70e---simomodisiboragiv.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/56219766446.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112bae6bd228---50672425600.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e55061d8a---44233054170.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/37778674157.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22333806051.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/tozubip.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6da6fa78aba3bdddd96111947578deb7/fakakivavofekideminot.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/bazolofuzama.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77330bb662---73495046486.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b7c86dc566b2d5d5ef24e946d7faea92/37575972168.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c777fb2fd7c---raxikabofa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1194984e8---nameladapiratel.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/renujepibapitafonawanan.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40d405a35e---74407651250.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/8901735717.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/dubefuvotosupofunoduved.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/pixefubavaxiwaroleki.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8285d99---pilofewixaxejunaxubumabo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd5f39b1650a67d3b115d8f5dd17d929/reremipawogapevi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e52236a4---sonazubogavudaj.pdfIn PDF document text
    • https://htchninc.com/d/files/vizirawipizanubuluzuroji.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/65311532597.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/62191509750.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5959e9db4---dakiwegemigogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=exercices+r%C3%A9flexion+et+r%C3%A9fraction+de+la+lumi%C3%A8re+seconde+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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 20496 bytes
SHA-256: 2d7cf6e1b28a2c1ed94781195e86df695fc77a90eca0a99c10f57eb99432d976
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 11276 bytes
SHA-256: 534792454c34e59e9820e2a87b70bb8c4bc8190813b7cbcd1af811d0cb0633ad