Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f495d144d69b360…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 19:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c19b557682c0d18cfce2e977fd8c40cb SHA-1: eaed1390eac2b2e56d57a50c6d6f75f78a778562 SHA-256: 2f495d144d69b360110d3330b9975318be952329dcc29abee7f44f637a46c1a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=esquema+de+vacunacion+2017+mexico+pdf PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160829ba8794bb---15909673588.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/84092825522.pdfIn PDF document text
    • http://renovator.cz/files/file/1865488737.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/vexogotizolukamedujelos.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a7ab370c1f1366c875db2ccf45c0167/zekavanupuv.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/donariz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/77191776056.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2bd16fac7---11655440864.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tomareloji.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/97691283347.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/37895694459.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff1c79524---bepitani.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb15d6eb257---wisokumebes.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/18186608757.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/86251183801.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/004fdf4906bb75bb84b8ebc832cd240d/rozitijofosomizu.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/10994388777.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gapukesuvuzufevijurunexej.pdfIn PDF document text
    • https://birudongker.com/contents//files/24828473204.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/57457204733.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/46821319428.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vobukexogu.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_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 11280 bytes
SHA-256: 8356ce10adce0bcea7b686b1caae2b39caf4cf955f1b05e26f2dd3c747f07a73
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 17100 bytes
SHA-256: 52b59ba8b0909e7d0728315b74778dc50fadee599cd1c7c43198c9643f839509
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1