Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d42e0200cd18005…

MALICIOUS

PDF

70.1 KB Created: 2021-05-25 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7299eadaf891641bb6d0924051538366 SHA-1: 5df55edb1fbfcabbb73c26c4b9b1b9e6fb5deaf8 SHA-256: 5d42e0200cd1800546bdbb487cb1b135234863b4555687b7b7b228976df25940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1758c922---19194269817.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/td4nofhevd7kjdp0a4cd3e208t/36262092209.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5d1bfaddfe6ba2c42e0b856f6ab3eefa/65783664578.pdf
    • http://aliglobshop.com/userfiles/file/kajazafezuvoded.pdf
    • http://aisef.org/uploads/userfiles/file/file/norewipamovagon.pdf
    • http://abpaluso.com/upload/file/geguwasilobawizura.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160845f9d08a6a---wajupironukane.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f0b23370ee41ff9ec43f8b9d14ab171a/55139415479.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/912372dc12e191aa19f7cd0b35146664/watewumeduliramakajigawal.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b8b6a463aeb88a0f8f79dbab93b9148f/xepoxixetodeleni.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d5e3d2182b389137766bd51807be80e8/88790450926.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bba6fa9022---71378046705.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3db0333ba022f54c6d6ccb2a43b5f72/37536614870.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5n5dfdn5f2lgh7nf5vhgr69g67/14606290836.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/88a47a0e897fefe733a846bbde928b2d/40980167012.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906ab55e5f7---kozikulurogeti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+printable+4+digit+subtraction+worksheets+with+regrouping
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d575.bin
717b7017ee4259ff3371d4880897dbdd06fee66294a55b6b763dad1ab2f8b1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 5672 bytes
font_01_sfnt_off0000e8d5.bin
b89cc0b6e6c44dda444b327f0759fdc7715ce0946c3da956ec7328c83ac0834e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 9984 bytes

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