Malicious PDF — malware analysis report

Static analysis result for SHA-256 d225167d2719fd9c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 22:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ada41720b513af6227858914bccfbb21 SHA-1: a141eabcff1e1be8ff914f06b31ddd07d9039f7c SHA-256: d225167d2719fd9cb289809a29fe25345dc08175adc4c5d1c54f96e459c22476
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many hosted on compromised websites. The heuristics indicate a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=pdf+software+download+for+pc+windows+7 PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076b55d393c2---vobukipiximazapaxox.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/6368920348.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/37919241338.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/95417987758.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/4f7ccf7e13efd505bc696aad46758571/zoviv.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/45772dd5509aeca04a7c6846d57497b0/barog.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85803024751.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/dewumajaketegimitewogarav.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/glfrl6a8b1esqpni5truvc6g4v/52142478811.pdfIn PDF document text
    • https://lesura.net/userfiles/file/kerawe.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/47399753430.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077019416363---77537989499.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mefujutovugafosaxerogab.pdfIn PDF document text
    • https://amblamy.ee/upload/file/45130737718.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/13887256865.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210704112041_7avg59.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd5369a46---52255483943.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nesepolamedikalikesagef.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28fd09b7fdbb69024d666c6e719ba12d/lopijenanif.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0e56955c---fiwopesamelad.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/munusukemalabuxevexot.pdfIn PDF document text
    • https://buka.ru/sadm_files/1928659370.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mnqdq5nekvt9j9mefg3ef3te97/gatuzekonekixo.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/90422248775.pdfIn PDF document text
    • 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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10752 bytes
SHA-256: 51847e8ed7c3657ea0d538e18e1d099e7de4554e2192e32129a22278e3ee8262
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 17284 bytes
SHA-256: 8c1ae5bdb6d7fd296e231200e9dbb41527fadadad387feb19648bf6b8bf8fe62
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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