Malicious PDF — malware analysis report

Static analysis result for SHA-256 3529de3544047006…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 00:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d34eb6c409f15d8f1ac6b0a961c12bce SHA-1: 3742de3f818b14740a25d2e383dc7e8437aa344f SHA-256: 3529de354404700671d2fc9f5dd3e38be15625405b033772a286a8af61a183bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=ielts+practise+test+pdf+download PDF link annotation
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/103802574.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/jigagufututonujewatovifod.pdfIn PDF document text
    • https://efnnma.org/files/file/rabiluzeloseki.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/kimajosufogese.pdfIn PDF document text
    • https://press-centr.com/images/file/90626083642.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/94126748790.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/retiduvatarupefekuwogi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aea1e55c2---64578030848.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5782650144.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mukifavo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d42f0203---verifuxexelava.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b97a664da---tekilogewabetepepumoma.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/i9m3dd0jmpoqmn75f97bresea3/44813505619.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/foxibesozavonaxiv.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/xurenatu.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/730229627.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n2reurg87g4mmdsltthcpfc8s3/ratovuzebomemaf.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/84593315906.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79b5b898f---83125835147.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/61643728596.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/88924729626.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e7eb7dd4b---rixajitolotemarovinag.pdfIn PDF document text
    • 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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 10648 bytes
SHA-256: 83df4d68ebb4e52d5496539d9b31cffdd18b3122bf874a7d20cdbe11596c06f7
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16436 bytes
SHA-256: c37607d51cd40340d28cb13f9b39b84e2ccacda88dc96b4af4d9d4f75ddb0818
font_02_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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