Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d40527f773af2f4…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 11:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: acfa58f3fbb32e9cd3d8699b457abaea SHA-1: 7e75423f8ef60478c486d2debbd4a01acf8e594b SHA-256: 9d40527f773af2f45a4c27ceabee23043ed4d563823f117e3f34997bd83593a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1s4j2htidsmdab0cf5448b9eb4/vipazojem.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4336c0dde7a66b00a59e880f1b33f16c/14764551060.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/wobipojokunanogixufebegag.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/rebadik.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lowiwe.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709cfc8b85a---13259526698.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/549997dc64d0dd32cc0420591e51347c/fepopasi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ccefbc9---kamibukevopew.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/tinigatowezizijalozonomi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/lunugi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b504e63d1671e3928c648fb4ea37644e/85355511845.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/bisil.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/86243522067.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cdc1903c---93180167614.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kikogikokelosumekugazex.pdfIn PDF document text
    • https://mollis.rs//files/88759265781.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084a14f73fc6---36393145498.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/53629241685.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16078b963e1a39---862486069.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/danub.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/2340953400.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773a9d74755---basimefogasopa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210525190042397526djy286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=z+distribution+table+calculatorPDF 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 17172 bytes
SHA-256: 5f7f8a5fe983d00214f1c01b9e611cc7f3c1c65253413a0bfda59ff00d72bcbc
font_02_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 10568 bytes
SHA-256: b626f294100ab59300d850c993868e85af457e4131b3867f6a7055efa0bac9cb