Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc353529f4d4ad91…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 03:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82cf2e805dd22c8c1b76ff1935511f6f SHA-1: e4476109beca51d5d9f69875ba4cd0d018bfc0a5 SHA-256: cc353529f4d4ad91a6ea35579feddb801f7def09caf69a92bf7d698d6479a2ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to direct users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://synerhu.ru/uplcv?utm_term=midnight+sun+ebook+pdf PDF link annotation
    • http://mmckno2010.zkosuchdol.info/files/19191199897.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/60715504291.pdfIn PDF document text
    • https://masukpt2.com/contents/files/madogefala.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zuvumiw.pdfIn PDF document text
    • https://diphong.com/uploads/dalidosageboxapolifel.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rafazeveguwisokifo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090613455273499.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/91560046620.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/maduloveferuju.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c2d72eaf7ac4c570e881d846e28e2bac/51378576905.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kigodokimoxa.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/36922742574.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161300acc0e662---6765792816.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905053836191129ggkv8u.pdfIn PDF document text
    • http://julianina.de/upload/file/tanukabolevefagumigu.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/89773076633.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/33138952186.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/vesovepinarawimi.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/42335926528.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05d8a84ecc00b7993003d0e6565cf634/78647942991.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/11535590917.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/50171004871.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901111306.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/nemexipaka.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/28803040795.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 19120 bytes
SHA-256: 713becb4b608b548666df0ebffea7e6472c576d9d2a8c7744728e61d1f4aa70d
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10792 bytes
SHA-256: f7bcc3ac60acc960ef2baaf8af72ba51c75c49009ed775dfd30726cd8dfee468
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 18032 bytes
SHA-256: f9cde1762e1eaa63cd6532be08c9113e182653aa0a637193493751a50a95e3bb

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