Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded4ea5b40e65568…

MALICIOUS

PDF

96.6 KB Created: 2021-07-26 21:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6617e53e9e84ee99c6ddea274712c2a7 SHA-1: 7ffe1f2b04f0714fa18d4c608418d542fd83b31f SHA-256: ded4ea5b40e65568f20fa63244d2d26200565dd0184e098ddbf9aa64c35d8afa
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate it's a phishing lure, potentially related to invoices or urgent actions. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1ccaf89pivfg1krhh4lgds5s02/sunobuweresutisekimo.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83371600678.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/veferirujamidineg.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/2918723912.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/85966782629.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/bevenotitagelijakavu.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/fawima.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/nalujarewofokuxodup.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/85738249778.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/konuxopubuvuwe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bed1ac7d15600ae8f3f8129ae29c8bc0/zosifiranamovapadasimi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c4128e5d5826fab543fa0765a1e2271d/lisagu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8e5566c32b2111a79930483d26ca3848/13485798.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/o206ikf51pebdl6iu85qspklgg/sotezi.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/5aa0914974ac4df92164db97df99672c/keresezemi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070db7fe3058---kupebokerodemenalerusifu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hho9cnn5pr3bok7oedtvmam5ni/ketegozebinewijajugoxowoj.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jerelixaxelezosovejog.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/17138938963.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a694dd1be0a---tozulukabujuwod.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985b351785d---wibelovalizabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=e+way+bill+format+under+gst+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_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 17588 bytes
SHA-256: b3a00a5a51914ff80e89867a2cb10131b2691ca0e8742fc7cdfdaaa620de652a
font_01_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 11264 bytes
SHA-256: 768c67eefc9c405557b1a7ae5d5bd562bb92b33f59660a4c2eb8ed4d1d1584ef
font_02_sfnt_off00015bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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