Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4dc1f9b2ef8080…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 14:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42a900d5d40b2a90b74fb82f39f7bac3 SHA-1: 112cbd2be0d525ca3654d44e99c2998558d8c5d7 SHA-256: 6d4dc1f9b2ef8080242c5c8729a65745493dd572a9eca7436a103785933f0296
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ropesadventure.com/d/files/34522728972.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309465ddaaa---pubotelotazi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/34033738286.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/22373387289.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e8b7d2fab8e8e4ec939a46b49280f1b/gibewotut.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/44058506598.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jisutezexagidusevudo.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/gopedezubimap.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/wixovevuvozomawetijalefu.pdfIn PDF document text
    • http://contextuae.com/resimler/files/25050072620.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/687cd46bd28ba2f743c88e895494fcb4/dakugun.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/tugiwogoru.pdfIn PDF document text
    • http://melvin.cz/data/45534929.pdfIn PDF document text
    • http://jljemc.com/upload/files/salexepove.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nofokivew.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kojojejefivunejolo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd8c539a3---30611728047.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/92266287002.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/44557430364.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/61729255402.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/datuzudevis.pdfIn PDF document text
    • http://ellev.fr/upload/files/bilipavelirin.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/89409723539.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rilojiwubedusopogirigi.pdfIn PDF document text
    • http://whitepalacegrill.com/userfiles/judubutow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dokkan+battle+jp+mod+iosPDF 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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10816 bytes
SHA-256: e9f2858dcd64c890defdf4f7587e6fc85d7bea396a1bf5b75dbafedea57adbf2
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16840 bytes
SHA-256: 15f0f602fda57577bf90e69f7bf2e328e3f6b336a14d43d69c2c1b5e3f979a96
font_02_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1