Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da3fbf9336d692…

MALICIOUS

PDF

75.1 KB Created: 2021-08-13 15:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a6ee688851000e4dd0b436a53621ed1 SHA-1: f051103086677135cff6d1e1d3f80adf4161002f SHA-256: 41da3fbf9336d692e54f13e4d9fa6c0ed1020059c1dc91c06c6b7197d93b72ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall detection suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zonweringnederland.com/ckfinder/userfiles/files/81903916836.pdf In PDF document text
    • http://campfirewtx.org/userfiles/file/wokol.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fizopibisukixijimabi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660e0565a1---61689947173.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-5/20210705110255812374.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vemenidebodom.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cmmo12t0n286rkk3k0ae9cjp1j/tafipelakegogisexedekiz.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210803191746.pdfIn PDF document text
    • http://royalgroup.at/tmp/suzab.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/vupugovomiwi.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/rawazoji.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/29b8906f49c2f4e7d377f9dda5056d38/83293309095.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f418e5cff84005783b462bb5700e14a5/libudi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vamawukukibatix.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/51281218434.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8178b090a5---18395531384.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/xodinumilesubo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/89523571377.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/nelotumejanava.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/62326165514.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607d416167c4c---30701681966.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2b65000eece335b33933d5135c295e25/delisuzuwofemu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/67944474717.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jidizomevumetivotaguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bill+nye+nervous+system+worksheet+answer+keyPDF 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_off0000c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16232 bytes
SHA-256: 949e5e9090d090bf85729c6b4440bc9d3023d08e580c73f40fa065a696d11767
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10884 bytes
SHA-256: 9f597c002cf2472dba9fcff89abcacc2f621124abf734cbcbb76ce5a9821fc9d

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