Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e3bf2e03d3bb61…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 21:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 79b08716de2d243b9105904cfe163dd5 SHA-1: 8da9c8abe4657911879672f9dd897599b6e3c644 SHA-256: d3e3bf2e03d3bb611b206c8bc5b36f7f430d0712d6182988b953d848574f4931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm strategy. Several heuristics indicate that these links point to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=best+illegal+football+streaming+sites PDF link annotation
    • http://mylodge-naoshima.com/16510728925.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23eb3960a---3986957942.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/52545868108.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///55266848726.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/voziji.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/26384336537.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dudibazidozudeselimag.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/jofigu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/bamukufa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/76779839476.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16764426918.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/55988748469.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc38013b20---pobakarefanaxixerovoz.pdfIn PDF document text
    • https://gornjastubica.hr/files/45662312421.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/37309661517.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/wopefovanunalafewoxub.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/nonakasolebize.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/vukavivon.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/56333250320.pdfIn PDF document text
    • http://tcihk.com/userfiles/tukugegusikineboguz.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea3fe94f3---wutuwopikoweseno.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/21644764000.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fjjru9fsimjb9f5sr38j515elf/91818981924.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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 18224 bytes
SHA-256: 9c76ca16ba92809b1e0909dc335a731a16fa2ff84e68955435fd3db2c6c3e377
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 10752 bytes
SHA-256: e35b881b060b4e0f6f57840c13285f30db51eebbd2f4261b253fe9e5cdbdd9de