Malicious PDF — malware analysis report

Static analysis result for SHA-256 6745b91a8304e306…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 02:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 770980bf76f6b2731e2ccf452535073c SHA-1: 2b2a63c5832799834d12521f67663318672c27cd SHA-256: 6745b91a8304e3062f54a6128f3b0ec18d897d25639caf4d2f6ff527904c8526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.mousumibanerjee.com/fckimages/file/1132740838.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/beff6da774c08d152c082bb5a466270e/juwumorokakoluxujamezina.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nubibigem.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///14854399405.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426d503358---logefolo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/258e940cb56780c54bd72508197d088f/68364747460.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kogulavonidon.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/29684347567.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b99a77c0---dimafupasuvaxasoginapad.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/65190716466.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/41852527956.pdfIn PDF document text
    • http://steinemann-ag.ru/63710241849.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0e1b38372b6568de81a95b95f9862587/54266643994.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab9cb8cb8---gunuzat.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/mejapupaxura.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/mosenir.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gubufoleromigarakidus.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833af2d086d---fakojatefabotil.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf0a46fc80---77722651682.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/punomibu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67271653657.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073913d74d98---77061905783.pdfIn PDF document text
    • http://uchid.com/uploads/file/jebupiwew.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/kosurojiribugojapajuf.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81e602355---pefofiboduvosores.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/numalawupetaniwelabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=up+board+high+school+time+table+2019+pdf+downloadPDF 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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 17492 bytes
SHA-256: 28d78adf63edb131ce30fb77002bea229f2a778559c08cd640a8da5702e6be5d
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 11760 bytes
SHA-256: ab1e6ac091086e00f082138a2f4ae1dca1c1b3f62fa1b83a6d43488e65641801

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