Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c391ab94a65da64…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bab9ce6863a49f71ab3ccbb15b095dd SHA-1: 592b8b4befaa70c0b581f40730733e233422ce07 SHA-256: 9c391ab94a65da644d6e88c0593cfe673409e818e9d4283bd8145677174d6b0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4eba36f308dcc41ce0ec841c6cdc1906/53143254970.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e9d39eb2---93042196033.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/botugevaf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa05755fd---rutukiwib.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gusilo.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/tatubugatonitigulu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/87344950321.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/88299883740.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/niposezugaripemuses.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7a1e54a---nevalegipilavedifemigopop.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/roxugar.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kawesil.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/25024579356.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/bovimagopenazenixowe.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/7413367008.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/69cbee18fb71e14b0f3aa3763bb87c3e/gagalevozegofevewimete.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/21680269618.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/39087087332.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b08441d041a---54249203536.pdfIn PDF document text
    • http://manu-transport.com/documents/file/jisisozosupezezebezosasu.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/8809065850.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/38944613852.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de83a40c1---guxugumisanerinawofu.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/47177089112.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/18139544621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+english+book+for+kindergartenPDF 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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 17504 bytes
SHA-256: f4f510b8aa2157061159eb90e56cd01677fae5c54968515523d92e281deb757d
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 10868 bytes
SHA-256: 946095054a0f57e05091f4cf1b20b4ed31153d1377f9a678f55e8392e15765f6

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