Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b34b7a838c14140…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 23:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ea0910e2f2cdff326e8bd1e3fe32619 SHA-1: 9f7781240f209ebd51639d8f4ca07b2dfdcaf252 SHA-256: 4b34b7a838c14140d01638ca6b73db7570388aec15758631526772ff6826ac87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medicalproduct.hu/images/files/gajufisobutuzesedebetije.pdf In PDF document text
    • http://yongchengtech.com/uploads/files/202109061818272323.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/2900319382.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/zewup.pdfIn PDF document text
    • http://tano-cable.com/d/files/zekoganenimolasadobajup.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/rotupejalenisegisoxabaxed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96ff63a5dbe082aa4087b4c75f2ca683/88116209354.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/merabepoxigijeterawak.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/55533255612.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12073868030.pdfIn PDF document text
    • http://jiab.net/userData/board/file/125746416.pdfIn PDF document text
    • https://birotex.rs/images/files/xukula.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/vilaniwesigozure.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363fa48a2d---83390264863.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/7613885456.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614184221ead8---99595920230.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/44120255605.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/34358938234.pdfIn PDF document text
    • http://a899.net/userfiles/file/jemegoboranevevofofogij.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/keborulofavuvir.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/xotel.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/56625243144.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/76495596589.pdfIn PDF document text
    • http://stevis.cz/files/file/wewigaguzasiwetixejitara.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/84170289863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=plan+de+vida+pdfPDF 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_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 18020 bytes
SHA-256: 95730f581380b6689119672ca9a27eb38842b02eb2f4ea59d7164f394e5e3784
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 10072 bytes
SHA-256: 9440e48f895cd5ce46a29caab12efe2f9986ce5c68b547273e98551b1bb88461

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