Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1d398aa78ca1f7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 11:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d2280725e150eea09d4359d1b517883 SHA-1: 97810290b9f631d85cfd1258edd2ba4d7f5ce144 SHA-256: 5b1d398aa78ca1f717d5fb40ed2246587103f4fb747a828eb6a61eaf5a0ccfd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to compromised WordPress upload directories, which is a common tactic to host and distribute malicious files. The presence of multiple links on potentially disposable hosting suggests an attempt to obscure the true origin of the payload and bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b0d2c480---2539663380.pdf In PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/doxiw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b53c97eb7---52254360920.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/14315135518.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/50011224562.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd6c12dbd2882856e8d48a8dd8c0cdaf/26204451204.pdfIn PDF document text
    • http://bronia.org/userfiles/file/vawesifugegafuvofej.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07884c06d---59153158939.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wejokixelokixetegusisepe.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/55511157791.pdfIn PDF document text
    • http://cocoal.com/uploads/file/59153910126.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0dfa84f1fb28773bf964dc6c81354d1e/20305059189.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3e08af72746729e24cba9614fdaa480c/jedatokixokoku.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/16378108375.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vosotesonijipuk.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdcbc444f---jakexefawiribez.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f20e35bc---buvutifajofu.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/revogizizoxojenuxigagoz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e96303a54---18590563278.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2c281e29---89210237559.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8io0e8sdtf65cjdd9u5thges4/vetesi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0buo65d14408l4r1sgabie2rv5/63570912692.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/11a077c5cc7faa7aaad1004e2413c56d/vizixuradeponafilov.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f940b0210c---60454130075.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d96fd68c84fa6888eeff660eea3a63db/fefedopiruluk.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/vomoxujigadabif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clear+phone+cachePDF 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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10144 bytes
SHA-256: db926ca55bf07a7a4169097a5994690d746e4d7abe06715210f571e30cc64497
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 17484 bytes
SHA-256: b95df69a6feedfe40d7e65a1c96582a40e85e1a1184d964d5c92af4ee504a970
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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