Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c63f5c5ccbfc35…

MALICIOUS

PDF

82.9 KB Created: 2021-08-24 18:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4fa2cbf3b53f8c14fbb9fc761ccfbb95 SHA-1: 9d628d27efddff7f83d0459e07d077706f5e647c SHA-256: 64c63f5c5ccbfc350bbf2cdba5038730b4f57df55ce145208f03dd5b81526e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of external URIs and compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=wise+county+tax+appraisal PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5183e3d5a---24598053580.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817825fa90---97799865159.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fejisemoju.pdfIn PDF document text
    • https://totounited.com/contents/files/nolafobud.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gusetojazurafavamipir.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/85557675890.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nimedataluvu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e3addf8178d4861531ff77e98e8f2b9d/bipifibaxidot.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gunafimagojoziwap.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0608ee6c4d---34015458828.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce91f96068---16139563484.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086dda639397---81514238973.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4fc50ab30dfe919deb08cfa3d2d13233/56141115488.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pezejovuwawudadadad.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q0o4l35hj9i86hlg782ot8cpq5/lavejamonezokoma.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/3973869543.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/ziroforedokawevu.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/vojijodekubakinuf.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/21232713680.pdfIn PDF document text
    • http://atek-ent.com/upload/file/49922242769.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4240a2a8dd---67035539033.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32365911f---lofuduso.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/21364610116.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/bogutadatex.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16560 bytes
SHA-256: 5db3f656444267a2076a92afe12ad0db4877062197110792feee84f4d7f4dad2
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 10676 bytes
SHA-256: 6529a0b361e7cac37c8e30ebcbe695f73ce06ffa3a1fd773d2d76542871c533b

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