Malicious PDF — malware analysis report

Static analysis result for SHA-256 e735ba380b89c8f0…

MALICIOUS

PDF

82.5 KB Created: 2021-10-15 06:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 619d1484a0b7a3d690014caf8ce7c7fc SHA-1: f697522db19aa224dc6f99caf895d00205a5e0f3 SHA-256: e735ba380b89c8f0fb10e3e7b9b2fca9bf1a6e525f5d326db920608eee0f13ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning by redirecting users to malicious content. The embedded JavaScript is likely used to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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.
  • 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://ikhmongol.mn/ckfinder/userfiles/files/fokujemifa.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/sunavuxupejibix.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/83320230346.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1634075784.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/36147584719.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/gadisenis.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/xexonuzupivipewusepo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b0dc550bb---xituwojuvuluguz.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/1860122395.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcd89a032e---refijotinupi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16162aee557229---sotoxujadoxaraseva.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/10522217434.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/miwetefe.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161315676af984---nufepi.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/sufixuxizukitaxexisisabag.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/petesimuxafaravojixijumu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54045ffc8ae7c452851abcd2b61b190d/tasixa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a2f0c43b0a8a9d3d0b194241003af2c9/xejubozuvu.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/zegogugakipezasa.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/neribabogasomude.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/58273909901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=relation+between+kelvin+and+celsius+and+fahrenheitPDF 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 11100 bytes
SHA-256: be7c488ab2db7985a9d4d3247c348af053d8b42e664baf5d124825003f4d4501
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 17336 bytes
SHA-256: dbfd7bbbe257c9c9a3cabbea5c8534f08369e8c518419b38a474874e05583271
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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