Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7adf18b12512f4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 04:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07e97df5c138f2c3919696ed164fe756 SHA-1: e78255dc422ad86126930ac71395966c97f3fbd0 SHA-256: 3b7adf18b12512f4fd5257f15d13701fad38d8ae253d3d48051fe633cf8e1231
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rosenstein.lu/userfiles/files/sovuwupisojuvokixanono.pdf In PDF document text
    • http://congtyvima.com/images/Download/14077099756.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b69a2406426df491b3b8e0008905ef3f/tolewowumiwunumuj.pdfIn PDF document text
    • https://olterus.net/contents//files/nabivobakubowujutugoxoba.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/14389587154.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/6848550400.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xewodosepijan.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/31437764624.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wumoramowazagomafuloji.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f628fb7e85---44297907732.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/pulodebotop.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/msuiob8v696hkua6ba9v7kgqgi/vuzojudadonarekuledosa.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/49732647420.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/93038862467.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/731e6a01f2791aff94b9879975f9e7af/76245746979.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/30111648087.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66e708443---daruwuzoxududidib.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/57407249727.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210621084836322598gc10s.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e03ee304394---79999440700.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/13168176475.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gorajafumexopejojepeg.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/29886098555.pdfIn PDF document text
    • http://eko-uklid.com/files/file/mekuvureposezijirejekakuk.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/29809051194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=auditoria+de+tecnolog%C3%ADas+y+sistemas+de+informaci%C3%B3n+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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 11360 bytes
SHA-256: 7843f2a256d79aa2494c8411e5fdca70fed0cae85e8dec7aac183109c0800751
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 18396 bytes
SHA-256: 19f0054d17dc36c7eda26f65e8d680c8b70566dfb9a375504b57824c5051d70a
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1