Malicious PDF — malware analysis report

Static analysis result for SHA-256 5998d80a4af34416…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 23:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72ef7c3cdc933e246311b6cb1ff9c26b SHA-1: 8f33d5f6ea577125d7f98d0a6b3c635e0f40a871 SHA-256: 5998d80a4af3441660b62c928957de407cf99b20058642ec8191a087257edbfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL heuristics point to a common pattern of malicious document delivery.

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 https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lnkmna31na4n6ifararp87kruh/wukogekeso.pdf In PDF document text
    • http://www.itidharamshala.in/images/uploads/files/68558913469.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_81C5376ACAEF8A3C.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/wedizukavataxawovesezego.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/fuwudamewunizulimetujatov.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/popobufozawixutoz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/95365382375.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/posutodovaridirufufibaro.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2736c3f860---lopewisuwonibi.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/21778768638.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qtn583ooisplhmr250f6t1568q/24315476035.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/wakodipejobibebe.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xawudana.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6s6bg763v5dette1kddn6rllpg/57664966224.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ihjs65kie3thqlu07n6dqtfmkl/bimugiguwabubexadez.pdfIn PDF document text
    • http://screen.by/images/file/manudowiguvurunatiguxi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k4v49pcm2pss2ifbs71c0alcp2/88142034715.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/nopomutuwexin.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/23801779394.pdfIn PDF document text
    • http://htwy.com/upload/file/33100882456.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/36148096430.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/pilopemexugunulesepi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd98a3b72b49ad8f8e100a67abe14c0d/gabebotonazewugudotapig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jacques+derrida+deconstruction+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_off0000c51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51C 10804 bytes
SHA-256: 43108b02c0631fa61cfb81987b4310699aaf4969fa3462574dc50a1939ea1901
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 17064 bytes
SHA-256: 48200fab725aa9af5e890074c2cfc93c0e9b9b4dc5db8473c245ca417cc9aea2
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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