Malicious PDF — malware analysis report

Static analysis result for SHA-256 828eeac4a8a1166b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 16:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 760e8d1493eee89afc416a3d6a438ad0 SHA-1: 9fa4ff60c97c44208c3ccb4d7e63e1ed1d1fa6ad SHA-256: 828eeac4a8a1166befdb80e0f6ce3cb8c4779ac9709eb9d0ac3333ceee96f4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary function is to redirect users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tresonance.org/uploadfiles/tapejoxexuzanimofi.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/40242768186.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/posatorezuwemogojonixi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441d41ef1e---valujiwalixowabemezexade.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b2ce1b7516a5701afa94165cca952343/kopelewo.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/13205289186.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/14755986237.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ea27ded0374a1fd3adf7a58e38eac814/lajavovowolev.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ab48e9d95807622b8250657c6d4ded56/madamarepejopiwef.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2493ca2c150103b4211dbd997d28ae29/97662315521.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/060828b188a8f2788574e6fb032ee117/15231531407.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/788ef9a1cdce70c7c71ffd35b921900f/41984881079.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d113f49e---tujagivef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7b59d10b---78928249237.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9626d9e6b3682953ef3462dc33083c5f/32911368525.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f8162a8b---wasudezogozusunababur.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/16412510829.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kuvafanotuxufupusiku.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/deparebogededuwumaxof.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/vibowagomaloxuvasesowo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094555c3e97d---51444383678.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/27744447722.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/vufalizi.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/37651601339.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/255ccf7e16873f9fa4bdd642d5aa10df/5294714183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aumenta+tu+busto+de+forma+naturalPDF 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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 16860 bytes
SHA-256: a7603b3e1224ea5d3a4dd0d9eb3a26f91a6f4ae3d20a89299c5059c31fceead2
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 10644 bytes
SHA-256: d5d6c324733e61f5c176ac56211aa28532bd184d514e973ae70ed9e40761ea92

Open this report in the interactive analyzer, or submit your own file for analysis.