Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36f65e2d2d93475…

MALICIOUS

PDF

84.6 KB Created: 2021-08-09 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9c2f614756e0eb66a146abf97cb7327 SHA-1: 015aaf9e042fcefb0015cf9fba24b6d3fc24bc3c SHA-256: b36f65e2d2d9347531bc21ac7a2a32c3d739d21e5887696dc87ad50aef4cd99e
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs further supports this, as they likely lead to malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7897

Heuristics 5

  • 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
  • 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://studiofapas.it/userfiles/files/doxelaxogi.pdf In PDF document text
    • http://suankaew.net/upload/userfile/files/58893600695.pdfIn PDF document text
    • https://etimes.mn/uploads/files/30381961557.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/pejijodosepomujani.pdfIn PDF document text
    • https://vestol.bg/files/file/15745664374.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/ruzavisijupenisevux.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd8b599a---surulupupa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb531e489---putigulofosorit.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8ff9553c---43030559099.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/253f9ac462cc417c155933550bd6ae0c/7221835630.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/vefijefifuz.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ca6b1578---wopakowima.pdfIn PDF document text
    • https://dietacud.eu/upload/file/kegilun.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kevesemivenelovunenot.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e9fbc332d---11157153738.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tiwuvomaso.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/xitag.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/90287006866.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/javetatonujujoze.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d5db37b7---wulegokobet.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/59bae48fad8bd1849b73bf8be2ab2cdd/zokexugezexapesesuraluf.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160f9154caf4f5---1845402796.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108bd0b3014d---14538977866.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/72835036475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cuales+son+los+sintomas+de+acido+urico+altoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 10664 bytes
SHA-256: d3599e58536d64a6a6facd0974c5dde6a035a7bbdccda9f383a5e9e9369d7817