Malicious PDF — malware analysis report

Static analysis result for SHA-256 03124668c0c2b79a…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 13:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 333b2049c2d463ed1ed3343775d290fb SHA-1: 81b5611b490652195593d883a0add2ba7553a3e4 SHA-256: 03124668c0c2b79aa554a8d37471eb3d27d46d66f60225019adc54bc07d106cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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 http://turinhotelcompany.com/userfiles/files/jevunidodesaso.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ceb06b8bb111dbbc39a7037fc7a1e48/kotuzaroriteba.pdfIn PDF document text
    • https://megashina24.ru/files/files/14810247199.pdfIn PDF document text
    • http://dhf-china.com/d/files/3640703885.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf292cd6a9c---rivajazotuw.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/mobukekinaku.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea66536b5b---79289798318.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc667e4ee1---gesejedazakitodafi.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judavexuwinegek.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/38994527918.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075879039807---monurepovamisoruw.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1df4d15d73c3bfa1310e5b9e66eee7e/3446797117.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113c7ce0f19---surizinor.pdfIn PDF document text
    • https://zzwgjx.com/d/files/29867114641.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee1333227---pakepubibakufawi.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/34742489024.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/lakidafabobavifiluvixiz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c502b02bd49---54358654065.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/55130258383.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/ginokunuti.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/89813293274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=writing+a+grad+school+recommendation+letterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10808 bytes
SHA-256: a9fd1fee74354e05fbdc3a41a07ad7f3591c087f4e1263f9db865ddce4491216
font_01_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 18180 bytes
SHA-256: af1f14bfe3a014b57b0815d13382615833f541a8e8bd1aef8f05839ed9803afc
font_02_sfnt_off00015877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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