Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca710853eddd8b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-07 22:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cd2c3b7352dda3332a49d4250bdccde SHA-1: e8555cc4b5780c296534b4d66e19c102008963bd SHA-256: b5ca710853eddd8be2c586df48d495f83e8d30382e6f055535b21e33f7eea463
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1876

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 https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b3058cc20774ab7e74f959ef7d41f766/welozopufurazozetane.pdf In PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/27088289124.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f19e193da---fabubowiwanix.pdfIn PDF document text
    • http://omg.su/upload/File/duxet.pdfIn PDF document text
    • https://emmaushuis.org/pages/gufesofoxido.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72d49e33e---51575521723.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b4322c13---kipimate.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160787f00e7a7f---zabumijugipurexefoworal.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0a16bf59fa98fa0f0745b27772a7ac6e/tuzozurigotikanimov.pdfIn PDF document text
    • http://esistore.be/userfiles/file/nanedatu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/11763512057.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f90vspuh1j63vgfrctu8vbg91/xedixo.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/42416494718.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe2f66e48---35532835321.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pegomuzorubixudutem.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8102dba12702260f6d9765dee29430c/girerafazasalox.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/jedadojor.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2187dc06---fufezifejifunufovurafo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a78cedd2dad6edfa331c09f1dbf9995e/58584591145.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/80089213532.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/gelidizabifutaxob.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b874678a7d8d2b6fb357c55580014148/makujidezekoderikiki.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2559a247b5---pulovakaxufo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d7c8ee8a1fb5b45ea911fad43ae5762e/sodivu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6414b0f4f4d4cb9c659af7cdb29ad236/xodaragikavemebufewoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=another+word+for+not+justPDF 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_off000133fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 18384 bytes
SHA-256: b1ec7d31d39ba1ab8d877b384d1f4ad28d6a2844b801edb758e053ad643fc0df
font_01_sfnt_off0001643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1