Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159f8c5c55502d3…

MALICIOUS

PDF

88.4 KB Created: 2021-08-11 04:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10cef0e2b15d77378d4bf1536d881b36 SHA-1: 955978dc05fe74d33b45f992d55057b671db11d9 SHA-256: 2159f8c5c55502d39374aaf11060f7aafde22dc421812ef2eba184b76dfcd3b2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7e7c74c---41475007602.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dugigatodurifovokin.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021619104613890.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/kisodikekilo.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/70354639720.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b615d5bdb15---vibapewodunavoguxemamu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/26924220914.pdfIn PDF document text
    • https://ksboutlet.com/file/files/46719687430.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161116e3c85c5b---borixelumewofunami.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d8465b49---terazuxixum.pdfIn PDF document text
    • http://capri.lt/userfiles/files/10637412562.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/40614000445.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae167acb9---bopiwajikidimosaz.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/85760159911.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/72129893550.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/86432652199.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/zilipizizawigiwetugi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ff435c268848ee28552f12f3b935a6e7/tizenubavolirikijuzeg.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b580cc4fc82---lujagino.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f82142501---74622303583.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b580c371a3043489b66d45e5e009b3af/venodezigat.pdfIn PDF document text
    • http://bienbao.org/uploads/files/36599795313.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/23037708216.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bujabojunalevi.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/38634664978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2k17+ppsspp+iso+file+downloadPDF 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16924 bytes
SHA-256: 98f02d70615cde73419e06f44d9a925364d66cc0b6ee5183f35fd4f09e85f93f
font_01_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10596 bytes
SHA-256: d344f25623823802080cfc184e5b10130c0deb633c088061e1f7b2b19869234a
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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