Malicious PDF — malware analysis report

Static analysis result for SHA-256 90620d69b50a43a4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 23:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b72602cdc8075fa92d4820c9adfc2ce SHA-1: ec87a34b663499324f8138613b883d7f49e367f6 SHA-256: 90620d69b50a43a4e353c1c83bae3ac7f381b20ac5f2904f022407eb6e9bde00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=odi+cricket+powerplay+rules PDF link annotation
    • http://apartmany.cucoriedka.sk/data/files/82669603126.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/59622934654.pdfIn PDF document text
    • http://sgpeo.pl/users/file/kijoxikebov.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/bulibajewo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/zajodememimavigezurisi.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/gotinakizesukusenemu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/69f6e2e335da89d8df299fd3819920c6/32104767735.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/25876037004.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/netir.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/gasukovowarum.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/39103251845.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/3296860850.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65571371048.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76219883468.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/jewasavulidanagijef.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/45183201995.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/67271926697.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/wetinov.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/595396f3940ff1077f9f74193acbb1c6/mupulerij.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109081611099622.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/10471056411.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/8831189856.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/bogabimuxubimapuwazak.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/zananunapav.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b46ec17d8---67352585126.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/56976504550.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 17856 bytes
SHA-256: 501d65b96fc38e222d9669830b68f53e2750cf09fc8a1b4ee08c31a0de302a0e
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10820 bytes
SHA-256: bee9406dad0048653b6f3e582621cf4c8c43fd5ef75d636010cf78fec61ca7b0
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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