Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcbffc96c4c55be…

MALICIOUS

PDF

74.9 KB Created: 2021-07-22 07:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8cdec44447f5fcdb0f52b2033c5e4bf SHA-1: 3d04d706672da20221eeec61c100c70a13386a25 SHA-256: 5dcbffc96c4c55bed7c58585eb72fea2b2beceec9d5d9735d7ec60839dab2f0c
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as a 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and other unknown domains. The ML classifier also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

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 http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c584b4fed---doxaxilet.pdf In PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/40979921137.pdfIn PDF document text
    • https://linoforti.it/file/zuvelamegelafu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e2e860d579f---nutojo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6d2baca4---1278736005.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d9a891db5b959dc3fd4d8a7a50c2fc72/rulotuvug.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab300f32a---redesevetatenewigovaga.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c952e28520b---kipokavoxawinuxofunajita.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ej9vhcvj9qh6khiee5vla7q3b7/kupikonepemizupegane.pdfIn PDF document text
    • http://devison-matras.com/upload/file/xekipulumiz.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddf8a0803---57163591313.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xuvujejarodigudix.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1765efa9bf00abb638f9e993119d70e/28687539812.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/vopofikegu.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/7811683877.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/fixomififojepuxav.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd0498011---gexevilile.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/297fb083752adcdd05dc4f026ca5b3e1/gofupifokum.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvr8508gkoifu9dtt3m9fk7305/lewolubodiredaniti.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb2c77eac---poxilagut.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/obb5kr22aqdmph1ig7uittkl60/57036964423.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bfa0ffaab03bbd00aeacf8936a9fc6f8/75021907593.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/91705194865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=parts+of+a+computer+worksheetPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 15996 bytes
SHA-256: 6b726bce7be92669d64a3833b6ff47a503611242b084e0f1af4c44afcc2d850d
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1