Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b95213e82c3b7e5…

MALICIOUS

PDF

73.7 KB Created: 2021-10-13 14:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b883cd5621b0ad71e37f2683f3573357 SHA-1: f3bd763983de03593e6781878622984cceb3abd8 SHA-256: 8b95213e82c3b7e567a028cf1d7e69a80b140cb2e210560a87f32014e328b5c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pinyardim.com/calisma2/files/uploads/85834885547.pdf In PDF document text
    • http://thedreams.cz/files/98011944818.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/letuxugupuvewa.pdfIn PDF document text
    • https://pecintajp.com/contents/files/25163243448.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ierq554148frucejc2oh9ca0bf/17802076520.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/182033359595.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/051556131281.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9e2c1bfd211143940a27736bb5475447/26519053056.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/81745476149.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/27323400436.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/39529452378.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/popaburajirov.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/sedejixoxoxupov.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/dalodibasupolotowewuluw.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/nirukivomelagofemumowo.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/15743517236.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/julubokebedegor.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/82456717709.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/43236825428.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/81857458073.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/37348870846.pdfIn PDF document text
    • https://ancoraeducacion.com/images/63114620103.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/77442853292.pdfIn PDF document text
    • https://southafricapools.com/contents/files/raxupukerenutoronubelupax.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a73181e3d---74152466254.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/lobam.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=lump+above+groin+right+side+malePDF 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_off0000c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 15532 bytes
SHA-256: e1db1e5812b072843caa6bf439ae15608c8b62e5b465a6e20136fab088dec36c
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 11104 bytes
SHA-256: c88d9bd9e5f24c4360eafd0051c9fe293c7784033eb2197996819065af13d3c5