Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4780174fde8a8b…

MALICIOUS

PDF

423.3 KB Created: 2021-09-05 12:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23c34e0a4691f95177fdcb98bc93bd26 SHA-1: d91f31a6f6cf286beb5b8e06a4fc75c70fa7551e SHA-256: ce4780174fde8a8b0d6afbe66cd59581b0fa2fed68ac53612fc68ed7751cc42c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Several heuristics indicate the presence of external links, with one pointing to a compromised WordPress upload directory. The document body is heavily obfuscated, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7098

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/dvfsd20r26ss61epq9hjvg3tcr/kibitukifo.pdf In PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/52892309309.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa04c3833---retetetaxemenol.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5c94932f3e5a7c3cac192343d26f25e3/2412966458.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf7852bc1---gikusuwibow.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/pesowodojosuniwaxali.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f8255d884eae46ef4cc1f0ecdf4c8332/bokotizuketola.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/56920564416.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kavajoluxamudu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1c9ea9e15c72f132d66e84c6a5a90dd/reraz.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a3e7572e---6305406318.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/33012811730.pdfIn PDF document text
    • http://juha.be/_files/file/xeleziroza.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/45334fa8b70414bf8119c3d3fc2dc6ee/xewiwenedugigufe.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210828180138.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ee64c79f76b7f3eb3c6026443a8921d8/4095688597.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607736142c309---pejawafo.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/38312189182.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb533de0c459a37645474fae499520e3/98901986102.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/96745959983.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/59868099655.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwenenedabonegonuvavaned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=benim+hocam+paragraf+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000610e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610E6 10808 bytes
SHA-256: 305aaee42ad60d96cf6505b3e662da3f5cddad92b44ffc3bd6e20a19337af4be
font_01_sfnt_off0006295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6295F 21044 bytes
SHA-256: af24830907c1c2aa5883d02f2b474ba7771d9d4b66b8164bee503b2629136d21
font_02_sfnt_off00065c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0006747c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6747C 17992 bytes
SHA-256: 0958f42b9f2fcb8475baa664bf670f5c69006e2e52dbff34e079b817aef1ef32