Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f25618a1338c81…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 01:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cca9285a08e322842f0486fe5897d8f SHA-1: 4d189b2adcd71e668562ffa9d88e2a4f23fcce2e SHA-256: b8f25618a1338c81507c2fcf13c54e7fc6bc17eaded1f7693748475cb00e6ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wildpflanzen-planung.de/file/22377598435.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/91476216981.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/08fa0d6586032627e452e55576f70035/20781210490.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/suduranovipokum.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/23321976727.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/rufof.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/luwugu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/88104122743.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/32ed3e5351f045da793503494cf0afb8/minalusof.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/lupojofokuko.pdfIn PDF document text
    • http://ridendo.cz/files/file/xidijifekimi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/23796312428.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wemejiwanirosadawo.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/78887559976.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/44375279303.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/31406825405.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160778484d3aac---wejedabexix.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/vabidisuparomono.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14900647960b458b342911.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4cb687415d99ddb615e90f02e54cc559/97338068892.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/purinupa.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/roboburuxi.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/sevonevokivololil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=igneous+and+metamorphic+petrology+best+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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 17684 bytes
SHA-256: 513e7964cee68ae1c8fc6a9befbdd4a94dbd377449b57018b87801a2d5100cb3
font_01_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 11372 bytes
SHA-256: 8009e57967be6bc18e13ef55b00af57fd12c90f219e0bdffdbf6c23dff8644fc

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