Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438a529d0e8c95d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 07:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26073d806ce033105ad6ccff7c3345af SHA-1: 4e04281e4a8093a6fb386253ae68a727d22a76a2 SHA-256: f438a529d0e8c95d2e41d6ddb54429c63f8222cf8e688fe628cc7d0e24827413
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent. The URLs suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading unwanted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=download+game+the+walking+dead+mod PDF link annotation
    • http://babyshelter.net/assets/upload/files/98520906952.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/pakojulajilegedabuvaf.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/65416178153.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/figelibozilejefes.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l4a5s2jer0e6g9id7lq067k5jq/gufewesorilasexonulu.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/rafapovagupusakedekiwil.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18999419579.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/21e840ed32171c40aa940bc9f81ee88b/83996562267.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc4a79f0310692265be6c0de4b3188c5/fusep.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/tazazugusidusir.pdfIn PDF document text
    • http://sjhtractor.com/d/files/nepilajasirenasegowa.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/lokopufuda.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/57236670439.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/kelimi.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/dabegutejiroxupi.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zamizavurabob.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210904_88C4E02125626E35.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64595866256.pdfIn PDF document text
    • https://tch.lu/files/files/70341292324.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/89932948175.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/87578804031.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93e004a8---vipivatiga.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c769647e589eba75c5102a59077afffc/76665654014.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/10564053386.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/17581575416130f78615fb9.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 17780 bytes
SHA-256: 68253657232bb7175ac3a7a44dbcfb27a48e9a2468f2dfa5922e8e89148710c1
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10608 bytes
SHA-256: aaed90f154c048bead875d1be73f288deb7334133f69753c073f475e98ef8162