Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a05a35c3e006d05…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a4591fc847afefced0abb3048dc7953 SHA-1: b435847efda33187c0d51e1eda4777133d98e1a5 SHA-256: 5a05a35c3e006d05d4e41289ff058e3bca7ce247f70a19728798dec574eca1e1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the PDF structure itself is used to host and distribute the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://lucidareemantenerepavimentifaidate.it/userfiles/files/gomuzal.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f361c3b054---16108381751.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072492fe3781---90344305773.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/62959992190.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/2677406327.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2f67d9956abf699496c27f40904993fc/putipexup.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af8a00726---ralikamogegazesevanugubo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce8957758---fetoralasivimaxex.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2b494d71---kurebisol.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jopomomefepavaritodox.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/kututezifagabokipoxewuw.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/6881470356.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kebiwalonixoritemetotek.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/096fcf9fff1ada0d68abaeb97abfd853/99940535230.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/46993446604.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/famemukovebemuzit.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/49005f52fabc9a71ee1a3e206e74f017/43519511361.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e52d9df466cec136ee657722cbc7217c/83556761923.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/gaxawexifusedivenetalobaj.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/womijelubox.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/musetajivunuzel.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/rewoxizovo.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/wixuvoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=el+modernismo+en+el+ecuador+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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 20028 bytes
SHA-256: 788de87a28d478f0ce1bfb8fb528d5facad394e08a08a15a247f745978f57a5b
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 10764 bytes
SHA-256: 11e4eb12b3d213c3551d4aef9e2c6b80804d935bb9add7f1e4aaabf9ed180376

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