Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71f491d4ab1b109…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 15:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d4215afcfadbe5c218d9f5732790344 SHA-1: 092802815081d1250a23ae79a0e60ed34e3e0c4e SHA-256: b71f491d4ab1b1095577113df788160f6869d72c570ef497e26a7795a3328933
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a04f2c1c8---pumijunotatarariwisibo.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662927d228---juvujogopopufotevenerax.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/39556368190.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/biwufotate.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/mivadabojomodob.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/96463640859.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/30057942754.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/mesogulunevisajijozusodax.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf35a2eb69---85294998503.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608211abd9ec6---29478000217.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/67bddd722fdb72054a30c55dc2e70038/44662027479.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/96012522982.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b00943e29---pibififibetadi.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/69430823696.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/745331c0ea764ff12fcd6835c73f6c5d/wabilumilatapupuzo.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/36524438208.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f24d848fa---fosapotukikudamimopego.pdfIn PDF document text
    • http://fotossc.pl/_files/file/2286604430.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c4756cd0---99398541028.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/2459972614.pdfIn PDF document text
    • https://diphong.com/uploads/jizinakitew.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/03ebl1ppibkmtdb5nc5bb4ak3v/mupomimojureko.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/mazugop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+run+baldur%27s+gate+descent+into+avernusPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10964 bytes
SHA-256: 3962a28c79c2352f574bfc602135f4d430bfe60229dc55587fae05f0f599ac1c
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 18404 bytes
SHA-256: 0c6b7b0addca2e24188b2e91fa35e716c0cb2c8fb417e1aed499ffd598bf2291
font_02_sfnt_off00013b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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