Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffe69349011b665…

MALICIOUS

PDF

85.8 KB Created: 2021-08-08 22:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 791256e25718d0b442e3669fa61113c9 SHA-1: 5ba7fda88c1c3a58b662e69334aae4440e5ec8c2 SHA-256: 7ffe69349011b665db87be489e3c71482b617b82494e60cfed610715b4634c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or phishing lures. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+calibrate+a+scale+without+weights PDF link annotation
    • https://rosenstein.lu/userfiles/files/79041036716.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9c1ccbb9---donabobavigubatamaj.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/fowokovudijexifufitaxadul.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/76024079400.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zadudizizerudirevapuraf.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd4e10ad8---tabeguliletagapab.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/vedajososujagijutafulede.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/toparamilub.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/diboroduniw.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/joxufomizutomadavofusot.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/50500554055.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ivom2g9qesm9plmpnei48s325u/99476808532.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/36306926150.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/17207895779.pdfIn PDF document text
    • https://defi128.com/userfiles/files/tadatudevotizazitiwet.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/75593914313.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607333466e16b---50486115364.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/vutuj.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fixaduredosijeduram.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa463e344---fefaxo.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/luxojiratofafaw.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/pigovarufumog.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/ranunubasowasus.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16944 bytes
SHA-256: e59ab677962a2465237997fda5daef9e711f810af82d7fbb944730ed57c44581
font_01_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10720 bytes
SHA-256: 667d809de15e48ec01b433c00f7c991f1b4370c67abb9fbee312b0eac9b182e4
font_02_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1