Malicious PDF — malware analysis report

Static analysis result for SHA-256 6254b1b0fbfb869d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b6a9571816c33086e9ba9d2b195b2581 SHA-1: 9287dde9d9c1d2f0d9ec79b3ac3ef86757998235 SHA-256: 6254b1b0fbfb869d49b8bcbd49ab3cd653e50732ca9568b7201751c38a865683
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext by indicating the document uses invoice or payment language to entice user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://allytemp.ru/uplcv?utm_term=important+definitions+under+gst+pdf PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/gumajejekovujisi.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/16061726486.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/42205792182.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvfh2a5d7rof9enk9qc4adf7d1/41631168987.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104130ed3ebf---78112417190.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/42776692706.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/38773812461.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc3e826c8---86250541634.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zabodezolewa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc75af0d5---muvorogotefeliloxanejugo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770c1de6e8---75578449136.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084adc2bce9e---85945355908.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610900316be09---19168350718.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac619b885---kuxaxozizapovujo.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/55710587313.pdfIn PDF document text
    • http://robedecreateur.com/img/files/99380020692.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/20062555444.pdfIn PDF document text
    • https://coil.hk/upload/files/lezofiletorezumokoxabeluv.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/88685971712.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/25l254maq69l6t7c7tnhonon25/13122865812.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe60af7e---roralaripaziwutiratiko.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/85588968538.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/joneloselotaji.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/fibedajaladexapowovovi.pdfIn PDF document text
    • http://artepcb.com/upload/files/mototovuwemikov.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16121187813d2a---94234182595.pdfIn PDF document text
    • 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10844 bytes
SHA-256: f249c52f0dcea914f909edb4396465e4346c518de7c432435977749409c7c6fa
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16980 bytes
SHA-256: b75fd0036f8cb152e2e6e5201488148749c941a7bda0ab917c28a7cdeebbbfb0

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