Malicious PDF — malware analysis report

Static analysis result for SHA-256 5418a74d08f497e0…

MALICIOUS

PDF

83.9 KB Created: 2021-07-29 21:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1262a557f16bfa4761ec2b3d43d6175c SHA-1: cf9f706a374a6cd024d514177e5076706ec2f44c SHA-256: 5418a74d08f497e03bff9b6afa68ac01925fea38e00160b6c9e5e4dae58df81c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://anmoul.com/userfiles/file/basabewavatugixosunewag.pdf In PDF document text
    • http://gptools.net/userfiles/file/59558313049.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/mitaxunawanojajeriv.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/20048592105.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nuzepaga.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikifosudokuveliden.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/21855147445.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/57371272823.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1224377e0e612a70f517a3cfabdd22fc/bijuwokimatidoximovu.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/44250262956.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/lobirarowonobunixe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/samiecvnfme5i8mfrsn0qjauhv/vetuz.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3fjf8g28sm5aaltmbs07nmeld4/91637067035.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/51753705733.pdfIn PDF document text
    • https://digireg.nu/upload/77743131766.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb24eet7bsd19ttthbafiqr7a1/vazuwitapipedufibi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160919d2b39007---69482171326.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/xoxegagu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19ce1aebbfcdba1aa1da86a898cd3b3d/55126285828.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/83343369890.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/43847620949.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/99713529062.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/nekufaliwadib.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b58c740a423337655c38961ec1479ca9/12895241381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tabla+de+conversion+de+milimetros+a+pulgadas+en+fracciones+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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16776 bytes
SHA-256: dc600fd53156a041010f751622c48e777c69a130bdd707b3e1a6b8680fba1d66
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 11232 bytes
SHA-256: 00642f41dc5eedccdee54907e3bbc7e80373110f6e0a06ca95e72b27c183f901