Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f4314c40600a1f…

MALICIOUS

PDF

94.3 KB Created: 2021-08-29 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09ec5be8c37015632516f8d2ce551f0c SHA-1: 47ed3e5dc05315c93db97273f78357765d993ed4 SHA-256: b3f4314c40600a1ff37ab27344ccc11159e2528fafcec51a6f2f6092482d32db
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the heuristic findings suggest it is a link farm on disposable hosting. The embedded URLs likely serve as a lure for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/708b6rpfj5r0t11p0ai1278ndf/6094546193.pdf In PDF document text
    • http://energo-market.ru/sadm_files/xalepubatagokamutox.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/48cedrhosdb00bjk6755360mte/sizewabexaxagonesan.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/67b296e5895e37957f58ef14e1b3b114/3928582998.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d43e3471fcaff8ed78ac7df65ba33001/39535809463.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/kivepapugumafuzunopogekek.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4k50fovmb98mmdvgpkphj0jq81/16554663353.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1catb0phln0stohe5iqprdh7lt/fiwenuwalu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084cbdde990---pabagujuk.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad69a71f83084afb5225c01e5d10c3e7/nujatipofiveludabomer.pdfIn PDF document text
    • https://equimat-cheval.fr/file/6424262911.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/wedotudomagupitapavarutox.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16ccf1fe436e153e518642674326753c/34490464795.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cee3dccda351a16ff11955334918397/1979134513.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/fifoleburukozos.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946961685b9---82045230722.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qisue72mfj1siot37svriftdf0/kodajekopifokovo.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/680645165.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160838da2904fd---gapipevumevi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbe41d8d2---repepasogurujevik.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/lorebupiwogitifopixebega.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108150935504587.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621195406.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a005546e88e---wakejiposavatasifajokakuf.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4e41df7a9---jotomefawaweregokano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sims+recycling+delaware+ohioPDF 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_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA2 10996 bytes
SHA-256: 3aaf95362ec71ca2592a58bb387aa61b0d2093d53983850e34cd9730730aff78