Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71c8099b5ce52c8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 02:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc4e8b0e0d07df6bda87cd48a4e65949 SHA-1: b65b3f38c814bb37fe0a2b4652f25ebe9c122575 SHA-256: c71c8099b5ce52c8a2362107aaeab532a810e269d44b7a4fba69c739ea8e0e72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through a farm of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f0f3ea9258d2bdca09d97af5bff92c6e/demufijasikiworapad.pdf In PDF document text
    • http://hb1004.com/userData/board/file/92580055043.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vegejut.pdfIn PDF document text
    • http://tochuchoinghi.org/files/bigogutipagenejiba.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/84966896178.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/68713754191.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/jitusevovi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0477ab59a7---japisitozuwilevexelovivo.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/80653614882.pdfIn PDF document text
    • http://netflor.pl/upload/File/21014959841.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/75139062921.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010c07a81d0---puruzitukamijovavigigovav.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/27961843470.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/rufegemasipalede.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0604838b6---66677583254.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b705be11---57773593833.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/5853731581.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160804cab3e87e---37834302010.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/wudejusufavafemigadeb.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/50159518272.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/puxajuni.pdfIn PDF document text
    • http://dogable.de/userfiles/file/5352177441.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1r82okjf45u0suhco40p0g11db/93448559364.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/71243863095c8f1067841ab779739fea/39170651762.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/53375150373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+linear+magnificationPDF 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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 18284 bytes
SHA-256: cf5291bcbc206ef620c0468b876c0cd51b7305c500d947a87c68d87aad2e5d86
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 10728 bytes
SHA-256: a6d5bdf4a580e386cce225f7a1273a300b90b1c4e8b8197d3c5edae461d87f88
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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