Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ece97e6432773b9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 23:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3a30af330265a6e9c1a522c2aedb158 SHA-1: 8b20944ee460c643de2748dc7c23b5dfbc445b93 SHA-256: 8ece97e6432773b9916345178a1e8a8ef1bcf2407d7e3832d20c06cc84d64109
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.anaja-inter.org/public/file/34715996426.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f116239c78---72357222615.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/80859215871.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/53891086648.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/99525850047.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/943ed18601c0cb9f4be70a082994ebf2/delafepavilugo.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/81540956517.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7dumbrgk7ivf8thf9bjo2in23j/53337956506.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2767308899.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb008520f---taxesekinegedakimetufazek.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wafojav.pdfIn PDF document text
    • http://ed-union05.ru/files/file/tisemoni.pdfIn PDF document text
    • https://tckontrola.hr/files/bupazur.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/butiwaganizep.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77793194479.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/66183983213.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wufelo.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/11738728239.pdfIn PDF document text
    • https://viceda.com/userfiles/file/nowifizekotalonuxemodod.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/77272547288.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/64341630660.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/24199757289.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/bokupibekope.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_2FC22F753A42D879.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/fupudukepebevinemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rate+of+change+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_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 10540 bytes
SHA-256: 2ce57313ed34cb63fe53ce66ac3996af79898bc6797771f99d608bfc3241086b
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16232 bytes
SHA-256: 4bbb3308d575ff5edf35c00056f75db183522ae8006d4e103b745f1144c5ce90
font_02_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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