Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4ee27976f7cb0d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 22:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c738384c02ad36547cdd52d41901de8 SHA-1: 7cb4a2b817977714883d1661cb92caa729435a82 SHA-256: ce4ee27976f7cb0d91ed27c485460796a2d2d9638c5745de73887573c78568f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading malicious files disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://notariocprietoa.com/notaria/documentos/files/34251834951.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e12a901943---72303827509.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da9b9b1144a---tawutixafunasunitibabal.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc535f3f5d2---88129100681.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/govizonotojuwike.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160854f20344f1---zewogafewixukuxurawulef.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/24813241116.pdfIn PDF document text
    • https://vestol.bg/files/file/jugove.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/guvomotutogugimod.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c04058e3a---89284467842.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68406c757d---81311044853.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/gibagovarijezir.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7acd0fb00---wenileva.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mefozap.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/jikekiwuwusit.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9195d3860---nujepi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cea9de93b5048003fa9a475b7e34b24/juvurigosekevugi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf9bb41e29---93259563528.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/68652131626.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b46a825d6b---sinatisipok.pdfIn PDF document text
    • https://arerp.kr/data/file///zesufomo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/vasagene.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/fc7e589275ae47acb880036c684524ce/rifanetexuwefeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=amaravati+kathalu+pdf+free+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_off0000b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 10920 bytes
SHA-256: 0b5bc882d4f044b48a33211a7b8cf174007c5ab4f766fa27c5ddab791dee6755
font_02_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 17644 bytes
SHA-256: 964ef8773e69ac7f678d6c8f7b6c1fcae3bbab301faa3d6a02351a31eabac36b

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