Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfeaba5b229c4f7e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 06:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce3bc21db39a3ad3ac4031dbd43cf75e SHA-1: 077c36c7fe24c585405da87c6636ffb32b2c55fe SHA-256: bfeaba5b229c4f7e86759b72e754ad45e41422a8f13cd2654f45ec3a31c5672e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into downloading a file, likely a payload. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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.
  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161306c040f579---86925921848.pdf In PDF document text
    • https://skiclubraonbaccarat.fr/pdf/pevoni.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d424423---39665453846.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tujukinikoxagawugab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39f27b555---74342246464.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/85033534785.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/5732767702.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wawusopifitogopiti.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/73123293294.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecbf8360d---42361587835.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/texavu.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/61108721935.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bonem.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d517701825---dusipatofijigaboridilobom.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/50262797949.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210901083638_512207911.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jotubuxalizotirodefosol.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/45861142371.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/tisabolabajiselemi.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/54972005569.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/mawopulej.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfe1c6746---73836601547.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/wigus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=think+and+grow+rich+khmer+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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 20020 bytes
SHA-256: cb688b9e31f474d3950fa23eabd43fd1e23696c6818e28f39873f651995c2fda
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 10896 bytes
SHA-256: cd399c25a3cb0d67be5f19742812f7d7f47b660bd02efe9faa4fe2c9139c18dc

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