Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad6c4eaff262ac9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8e53e71b0b27a3e6f82976a5eb48c037 SHA-1: 71e2a546e9754b91db1ce90c845295dc4dfa1c7f SHA-256: 8ad6c4eaff262ac924b25099edd1b31f16ab4f09648ac7854db2226b38fd171b
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 0.9911

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://a1-automotivegroup.com/upload/files/sozepu.pdf In PDF document text
    • http://altinay-law.com/images/file/nanijipaje.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/91608382566.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/wazugedolijozimusomujinud.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/89103062251.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf52ee9932---pemukulujog.pdfIn PDF document text
    • http://ailizia.com/userfiles/gixamase.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/tavasemedanekaruzi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/retatunetamole.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd93a4cc4f---8800094612.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/2050724226.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0d5a27c0eb71344cb6d9973ea451d2f8/laxigumadudakapaxev.pdfIn PDF document text
    • http://rts-3.ru/upload/files/volumokeribarusotaguk.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111d3b7b56---woxonuzokituxowelokuleku.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/5508896616.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/q6cpsithh7ot157e43navtqo0v/lubadebemiberitufapezo.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/sebijumezufifidabegani.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee9523152---fawax.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tewetatuzaxupixanezina.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b77739233---90095480086.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/638d2bd0f575921f4cf144d56acc2569/51708140439.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fd1d7306---puvugasixifinivewuvil.pdfIn PDF document text
    • https://remini.hu/userfiles/file/34269074160.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608317fdd9048---movevalikotona.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e659dce17aa74c56c76f18be3e5fc90a/leregukivup.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62631575154.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/57712456094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=study+iq+test+series+2019+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16960 bytes
SHA-256: 753fe10b9b4bac5a519f792e908763c917ba227598709c001adbe0157113677a
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10956 bytes
SHA-256: 0eb877f04524583755a30c18ca54aad88b9e796f3ac1bbc5db0a29fd4d923623
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1