Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b1b60e07dcc378…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 07:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 552bdd6f5e58abc77972624fae1e2970 SHA-1: a8f55dd746f7cbf7801c797d2e44c71b121f20e4 SHA-256: 67b1b60e07dcc3781ab56db8ff94086146bfa59921b862e2cd1ddab85841f21b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports a malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://puntolinea.org/userfiles/files/lagurevabugudojujesof.pdf In PDF document text
    • http://imoroz.by/upload/file/99925806246.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/rogerajevidodemino.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/42799742242.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nagugupugevoxetodufu.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/pebujifowelepasufef.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314fbb5664e---tidovufivonokex.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/fisopajupuluxi.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/61961626114.pdfIn PDF document text
    • https://dcimx.com/files/30884607753.pdfIn PDF document text
    • https://geloracinta.com/contents/files/81866827189.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/12568024011.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/detepalopumenunaz.pdfIn PDF document text
    • http://indexone.ru/upload/file/86976430792.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/wadakomuxas.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0ae9da47---misetefamerewedis.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421ddddc57d---39243171478.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wovijidevup.pdfIn PDF document text
    • http://kes.org/upload/editor/files/zaxurewo.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/faxirimulis.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/36856482578.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da068d510.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ffac4d3c---24859223763.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/af37079365f4068ceb405b5bf0d04658/lusejadotoredusedukif.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf5d5335b---93494183711.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tejesodidusexosawidodiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mobdro+android+alternativePDF 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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10272 bytes
SHA-256: 46e1924e691a883843a7f9c547af7db4cdac7b1a2878d68e344cfcd32cbbcf6e
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 18000 bytes
SHA-256: d2017ef8aeb933b94efa6c550a8b6fa21fb5d07d1cfa6c0dedb64dc77449d5be
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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