Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7cf6dfbeb76403…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 10:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c6fa77f6ed8fe10ab47a69574527a08 SHA-1: cc812797731a9b020c3e1cb9b1f4d81ba5ad854f SHA-256: ee7cf6dfbeb7640303f2142a9e7baf2f4f2dd5a25034e8e212e86f1b6ccc347a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a link farm and the nature of the URLs suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://k31szmq42-nu28.com/contents/files/11947400599.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96077b390---56321286832.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/79081517431.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/79006832210.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210918150526.pdfIn PDF document text
    • https://lorus.rs/files/ruxapu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091007431814.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/95704869662.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/19063175551.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e7534e6a---fosatowamewomavenotit.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/73822264212.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614332d9ce4ca---worijafomipidulejegimiloz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/42190137641.pdfIn PDF document text
    • http://att-na.com/upload/tuzeganewemaze.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/67961094021.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/56d9b2d86aa01204da0a74f8260c3e8b/fewuke.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/1668915500.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/womoburizefufeje.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/loditox.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/60295882626.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pufazatad.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gudusozexawinufuda.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/51491732622.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bde90f135---ratamovodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ringtone+downloads+apps+androidPDF 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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 10700 bytes
SHA-256: ead799b16ed03da2ec77a0396cc0cc1a85ab57b370274492f6bb1e999aa74763
font_01_sfnt_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 17080 bytes
SHA-256: 67e8d67e4be4373f29b4ef61efa81b3f768da358dc648490dea39544391e4364
font_02_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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