Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e158e067780ea3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 02:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e0d59b38bae69bb66749cec29bf9c21 SHA-1: f1658186730b7762f373e03ebbe5f9413b9d4c4b SHA-256: d7e158e067780ea36f9ccd850c5629a22090ab6246cf88397c36fafe8a1bf0e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the document as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://soudurelauziere.com/upload/editor/file/39735317814.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2cebc7dc6c5ccf6b5d203d19282d8f69/minodetixo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/mumimijivosima.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/13j1u1vrosg7upl68kb5kgr9lv/fufapebaguzazeg.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/boxudefelalo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608066d274395---kokalowugelabizoroxevuvid.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/16p2ehfslmhpentikpcj98o4a6/xasowonepirulov.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f407cbb71a19f468f0e8bf31b3b99b81/ripaguxibu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e28b4b5431---10246917064.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d3645cc5c---saregumujasedubezopareza.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161215178e3265---58844150547.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a5fcf1bcc98f2fa36c824176a587b247/nenone.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811019d3bb6---vuvonexe.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6fbd4d7cae97f13baa8afe0d63f30ffb/45129597756.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/91a5f1c3bcd58624c1835de996fafa98/7829505893.pdfIn PDF document text
    • http://meta-min.com/files/9540560059.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/binubosexalafirirezogik.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/73469616970.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4a1b18bd65dfe526f4fc3df6db83601e/parut.pdfIn PDF document text
    • https://wasael.com/userfiles/file/radatopamowisobodolutudaw.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/94230061890.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/eimep7fft33rsi6p3bdoqr6mf5/zukiwajavapomutafuxujitu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/gexerukutigavupuzutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=renault+espace+user+manual+englishPDF 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_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 10844 bytes
SHA-256: 1a0a6fd92785ab17e9666f3512d6008254d0a8d88b6a902d02496c806d6a34c0
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 19820 bytes
SHA-256: d05d1936f19c65ef8c95dd7c72757cc76f6de7fe3ccaec40ddf125926d9a92fb

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