Malicious PDF — malware analysis report

Static analysis result for SHA-256 438fc15f73f78ce3…

MALICIOUS

PDF

78.1 KB Created: 2021-07-03 13:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 169019d224effbe50561a606ac7065fd SHA-1: cca46bd3ce8bae1da6f56ab18e5aac510e0f0e15 SHA-256: 438fc15f73f78ce3a0dfcfa11aaa67ad45dbbd813337978a251e1b04efc08a70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7088

Heuristics 5

  • 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
  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071da3a94810---fomupixozikatumibep.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b35c111e82f---92175843408.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c367a14d46---wenug.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/ninafofujupozenegelozoze.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46159630929.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/51600000329.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f99e73e3---rujutigojodobazukuropu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9e35b3cbdf3f63622ac4648d3b226f58/betoriniromajuve.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/38937674840.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/luposapokapibubemisukedo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dd84b133---12125047139.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6e1eb3ab26bebca9a79b98e927986718/32407211290.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef7d7a5ff---xotidani.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/928925fa4c177735316b58f24149f3f3/siwotaxunosasujome.pdfIn PDF document text
    • http://accronline.com/userfiles/file/karupal.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/98586996252.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nirefij.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/sotuzozixedinawe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/dibusel.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j4fbjtiq3phfi9qlcod9eno484/72177387534.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff83330a70---takosodibinijusobej.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088364452999---49686948865.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c920ccae7f9---25020729856.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/womikerudirazurelowegu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5om59egn5u15gqh07gaulek6b9/moterurate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=butler%27s+theory+of+gender+performativityPDF 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_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 17224 bytes
SHA-256: fd721b0b084ef3970d0456bf4265ec36abf4d1d12f3bd8c432840acb4afb173c
font_01_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1