Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2532c2b8b120489…

MALICIOUS

PDF

109.3 KB Created: 2021-07-20 15:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1322a21ce7c40e63830050c4cb336ed5 SHA-1: df4ff508e352f10ca400517c0da4686e2cfe9e39 SHA-256: f2532c2b8b120489b8795dc01b59e9a84a7ab134a56740e6cca6c169e8ca37dd
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a signature indicating it is a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS platforms, specifically WordPress uploads. These links are likely intended to lure users into phishing scams or download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1928

Heuristics 5

  • 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
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8f843a24---susilumusat.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2ee1dff8f3ca73faf4add35e17352959/beporufuwule.pdfIn PDF document text
    • https://dm288.rs/slicice/file/doduwalajelagiripuditod.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b455de86fb6---58388458694.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/idkj4kh6vui5mvbh7b7p3h6rfh/74591638734.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd9453000b---49270391374.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/lorumokanutakowudamibip.pdfIn PDF document text
    • http://weingut-suppan.at/files/43752280418.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979b49d403---liwimuzufejuresali.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/6805904896.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609244ec30967---xutidonaxix.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e469674b24796ce3ba0d96c61b1adf/3417221944.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fiu27ff92c83janl0cnapt3p5o/50328495697.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607051bf54f64---zamoluvuduf.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51272936800.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077834aeb982---91571794787.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077208c9ea97---38924968525.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/budobila.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/93fecda6723589df8f403a201b33d986/radop.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/13529454602.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e5ff849b5cb655769a83ab2ae4e88897/37588913161.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/13474276853.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/48007954990.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/h9ur25vgr943pc3cks5p61o02u/vozigodazawilan.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/22026056253.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7e5f7ef256a1faf8875c2f9cd6cf0a9e/pimaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=name+of+the+lion+in+lion+witch+and+wardrobePDF link annotation
    • 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_off0001551a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551A 10776 bytes
SHA-256: edca413d08dfa6fb05fd6e9cd8cfd6443ebe0a83274ae21cf04db675e013d4ae
font_01_sfnt_off00016db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB2 18748 bytes
SHA-256: 26340cce8413306d09b7434ddbb8cc21da865f02f31b61cde9a9a19bc0454cff
font_02_sfnt_off00019e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1