Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74d41335ad39773…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 13:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08d338eb91d3d504ae72b11dc83e44b4 SHA-1: 18affc6230fd056c35799bf74acf42e310c75492 SHA-256: d74d41335ad3977392a51778f9c1162788619e34e0fd3964ec34d6c36b7332e2
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lure users into downloading further malicious content. The presence of a 'Browser extension / update installation lure' heuristic strongly indicates a social engineering attempt to trick the user into executing a payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yodishit.com/uploads/userfiles/file/paseriwokapegar.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8d7fb80ecbd4ad5c6220b50d118984bc/lunoremafitifonimizulam.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/tunijanoratugabuzubuke.pdfIn PDF document text
    • http://kim-clark.ru/files/file/92061670009.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/rowepeduwepad.pdfIn PDF document text
    • http://epmachine.ru/d/files/makuvuxubadizadosapu.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/megevuvevo.pdfIn PDF document text
    • https://areicon.com/images/file/76373486327.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75238c9b4---5995084634.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fevisoxopasoba.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/67604083741.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/79059425612.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342f654d550---redekajosexibijames.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/vixotidorob.pdfIn PDF document text
    • http://gzwep.com/img/file/202191185759.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/gabogi.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/poviwipimumerawabazewuv.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fugum.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/17938554781.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/44258972542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=es+bus+simulator+id+pariwisata+mod+apkPDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 18296 bytes
SHA-256: d2e20ae1fa780f41744db1b93efedb3367f86aefd2b81e2caac07edb4415b674
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 10716 bytes
SHA-256: 76c80036fbcace241b3aeafa522ac74b2d645f62f769318a7ba2dc844d664e99
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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