Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ddf85f52e1df9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 15:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45665125af7327d8f4df57617321c6dc SHA-1: c12ca4e6ebd776c45e218830a7061ad555914a87 SHA-256: ff7ddf85f52e1df9ef3a61c1d67b22c714515d23b1ca9cc8efb7e293a411498c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of embedded URLs and the overall structure suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=swiss+essentials+gastroenterology+pdf PDF link annotation
    • http://jmk.kr/ckfinder/userfiles/files/65915029323.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/heoja8on2t4kkcr70j9hpamep2/4218976376.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129e2c7d89bd---sozibuxabetoxi.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/48208831383.pdfIn PDF document text
    • http://vina2002.com/uploads/files/lapupo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d281b79c36---gaboj.pdfIn PDF document text
    • https://epiphanych.com/images/file/jerirusozaduw.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1ur1abd2qk53n15qkt02d1tcb2/63501469165.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611383d1efe0a---bogarilowotopabuzaba.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/291136572312.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/verifidazin.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/faselifuwuramudiwubo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e028bd644---32153658090.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rolagexipasokofukedev.pdfIn PDF document text
    • https://emenu.hu/editor_up/zifer.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4ie8qehmotc21hv8ktcctm67q7/66836188245.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cee8b31425---gaveruromixifevezimidi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/52423d2k11ade7e2bj0al1k4t4/woxiparulebovobagodabomo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76759456414.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/fenonodopopixawi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/58696411750.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/bapalumivematuj.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_off0000c2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 10948 bytes
SHA-256: 653e42b0bdf4c1b4f59995e24f0ba84f487492972fe63ce9a5902fabd8c2488a
font_01_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17188 bytes
SHA-256: e50ca365721033452c3de59e488f5a3e93961340d324afea7984134bbaad6360

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