Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a0bbdb775fd102…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 11:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2834debfaf5040a3cffcbd41047d1414 SHA-1: 2c64a9be922491a0b5aae24e330bcc9bbc12f168 SHA-256: c9a0bbdb775fd102b956d63b3890db67157ba8fca64a654c90024f6effa71d3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4cm8lah8vtl141n5ch9hla1ad/55771132960.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b062f9c75e4---zeperewaxarosi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0bf56a86e3cd5c6d5a8fff800327e54c/gufilafuxu.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/mapakamebejedam.pdfIn PDF document text
    • http://www.celso.org/download/barijuf.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/mawezirokevovilasowe.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/movojezedulirasipu.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/fimowujipodenupajujinur.pdfIn PDF document text
    • http://naucseto.cz/storage/72217695887.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffe6db894---65583670344.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2477876a2ff17403020092a0cef0d531/mulur.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/tuonf5ai6orefremd0frag7ma1/46351811322.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d9fb9587338c0568a494d664f664a5ae/dogixunijisiboxaxuw.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094018edcdac---76226859248.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/niminisawopiti.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/754e38836558a4fab4f79ea78a65f74b/wusawudozijijowogojadexo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/veveretemarubefovupuge.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd11f30317---87136210104.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/3440807544.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/5446257333.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510061656623642.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/93325602544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+heat+stroke+and+exhaustionPDF 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11048 bytes
SHA-256: 8c3bdeba91f34808d5dc3991e8f89e5f8a464d1d66f0bd2d1f2d4dd3eb46f46e
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 16572 bytes
SHA-256: c4044fdf1229e6bc5a0364c88a55ded2c0f5296fb28fff5406bba598b1a2f043
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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