Malicious PDF — malware analysis report

Static analysis result for SHA-256 caddae2e58d9b55d…

MALICIOUS

PDF

78.1 KB Created: 2021-07-24 11:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd84e51a859d3932ef639bcb408ccc4c SHA-1: 2b0efae90cafc1dffeec554622797b9fee788363 SHA-256: caddae2e58d9b55db49079617c9980325ecbc4b1bc4ea5b68cb796836a1c552f
154 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. The primary purpose appears to be directing users to external malicious content, likely for phishing or further malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6505

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt8jbj920hl9i4l4nb0098a1kt/58198515344.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p9bbtpohhbp221vvjvq1q7rma3/45717260770.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a41dba2cb83---mipubader.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/filaru.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0ee6d331333a65119198eb1cb4686fcc/70794055844.pdfIn PDF document text
    • https://bursac.net/userfiles/file/85161056408.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0114b6c69264235ebad092ba5e2ea8a5/41177229867.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/panulebexefex.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaef72d783929dd5cf97f2a51df591/44050693022.pdfIn PDF document text
    • http://apcmagon.com/userfiles/lajeravujedofusijezatiwum.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc139b2861---punumadulowe.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/jamob.pdfIn PDF document text
    • http://vodnik48.ru/content/file/37981466008.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/c877nc7ehc9fu03kplua9qgfr7/mesomumag.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/sugewefoxawasexofidis.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/24987998750.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/50028273542.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/naniposowuzofak.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/70385832374.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/75243291490.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/95176777019.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/wozafalegepirotejosazab.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0733a466559307d5e16478b44d305351/13836023073.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3fba1a1c---wibovofeginuw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tofozexerutigupab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+e3+error+in+acPDF 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_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 1696 bytes
SHA-256: 266b75d8d95edd4e06796966e43e1bb0a7116b249193fb313f1988fa9bd38e89
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 17476 bytes
SHA-256: daa1b02a3da7fe0639a77939b06f284a4a758eeb85bbffe64e1a426ad8eec8f3