Malicious PDF — malware analysis report

Static analysis result for SHA-256 997e68abdf97fc16…

MALICIOUS

PDF

95.8 KB Created: 2021-07-09 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52096fcd464255e37e02ead69f89c7a7 SHA-1: ad2cf4b539f0586f2aedeb694fdf4541516cad22 SHA-256: 997e68abdf97fc164a97caa62c09c7404a6b42cc1a67207d9ff7d93cdb40b209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute phishing content or malware. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=foods+that+prevent+vomiting', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://inwebjor.ru/uplcv?utm_term=foods+that+prevent+vomiting PDF link annotation
    • https://tolgyesvolgy.hu/userfiles/file/62141053403.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gojulenalezu.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a010f34899179f14ddb944bb46ed01db/lifaligebilinif.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095df53f09be---dowiwevorifirotiviw.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/84886106106.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/wivuzebexiduvevap.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160859a363cf03---ninoxekepakatujuzavu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48777ceff---vejadibojivaf.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/41ca581d5ec2502e6c0ba212b295cfe0/mizaloritojeputokukojezi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162456037753163200997.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2e7b27899342085ce2bc34f7b9f726d4/supigokisadudosaral.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097850ac554b---kepamawisaruv.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f5n94jnm8kan200gsoh86360ug/dejopukurekitojose.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/xupig.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/f2ce5vb54238063r5mr4b818c2/buluwutopufi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d34503c57---webefaka.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/57329533514.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4664cccfda---punokeliwowij.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abadee86c---sapiguvukevesipeke.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4drbl5e47kg3ifi0tujsaujeh6/22061830165.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/82101989750.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ca6036c786cea34c36578036ad6e0c8/xejavinesexurisavokodusef.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_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 17096 bytes
SHA-256: 1b3f564801985590f701c96324fa549f888b4799484cf046a06cea39af64cd7a
font_01_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A9 10836 bytes
SHA-256: bcd00ddf782941c2de4fff9b5587c82d505bac351f461a37da9aa7229f657816

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