Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad566e2ab2f8a5cb…

MALICIOUS

PDF

84.6 KB Created: 2021-08-12 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa59090a86648326a40e3016d39d0c2a SHA-1: 5a110d694b8edab02d0b497084731b843d0ce567 SHA-256: ad566e2ab2f8a5cb0ee2f05910985fa705d4ab171bdd88bcbfb2910a4c63c3b9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

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 https://virker-ikke.dk/files/95923541133.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9e321c72---gatekuvujurofitapulebam.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/57580626013.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1basbo8qaokov4uu8kdt1n40p1/39839090718.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wowuzegupebimusozovojaj.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/delarewes.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/xodajusa.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/16115098589.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nevorusudumeri.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/90081643583.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5efef8bcf92f3aee1cf15b442035c91f/puwelod.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/fonokatovijuniravupofex.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d24a1d01d5df3dcb308032b14d9349b6/mutabufo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc7829452---70393275423.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zegobazepujewowejitajaw.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/nidametamasuvum.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0d007bfff---nebabemaf.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/sidanisiwezijezurabaki.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/67786049423.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/gexasiruzimobosipin.pdfIn PDF document text
    • http://haki.vn/uploads/files/11017464246.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/948a35a4bb95f6171bf06174ac0624ea/17829482478.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e2e0f3cf---35983314717.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/35994917958.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sofudowovakinewoxesar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spelling+bee+word+list+for+grade+6+pdfPDF link annotation
    • 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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16516 bytes
SHA-256: be31f68b71344f07b44b893976b326a86b3b8155e7100f46f1b2f5d14fe1d69c
font_01_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 11140 bytes
SHA-256: a30e56f5aa7795db3fb0c09cd08b3568987209bb4a03a87a0d7787991d5b82f1
font_02_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1