Malicious PDF — malware analysis report

Static analysis result for SHA-256 b751505d48c97f9f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 21:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 753cc2744aa6a4962bacd7b415390d8a SHA-1: a9c53a67db0e10f2ca5140e84bc2ff1576e4d1ed SHA-256: b751505d48c97f9f750ab67df0abf349d01b9ecaf74709a95cab55e9cb9c0039
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/su17uvq0ue9156gifs3p74ld7l/zotivepifag.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/42817ccc65e7dc09f221731a052f8d85/74728906692.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/pofex.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/41202224584.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610784cd7aab9---87444721720.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b18594333---fujopapulesepobu.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/75927894906.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/fefujonavuvogeje.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pimuvozavuxalanexerir.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6aa2b41c2ad085072e24e1e31129981d/27867701689.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e66841e1dcc---41556047972.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/9480415170.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e465df35---kazopozod.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9a0b4c41f59a5211cccc071a8a15f9d1/zewoperiv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef9699ee5---lamuwabesivekipazutaso.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6166a1afc7---davosuzuzizemeri.pdfIn PDF document text
    • http://eternaseguros.net/files/files/giridu.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/35132574308.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/10ccf8d1ba34d1da6b352e202585517d/99184361467.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/lomabudirebikubalevifase.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/lavozob.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bapowusejixe.pdfIn PDF document text
    • https://ubranni.com/uploader/files/petutetenolazezivoxez.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/83244947477.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/61604574733.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128a1a71b735---xekobadazapazenoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+combine+files+not+workingPDF 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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 10976 bytes
SHA-256: fb1abd2f2a6d85bb1e41864c788bf9e51631799492489affd21ef4d280d36a0b
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16268 bytes
SHA-256: 6bce2dd6fa74272bcc57d1a85fba2dc282c50c2ff4e3ee39642b282198a37b1b
font_02_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1