Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4e92b245bcafcd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 08:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb0662241f615d795ad4571eee0a731b SHA-1: 290ff809e520d5dcd41097f9f8d56a7859f9a05f SHA-256: ff4e92b245bcafcd51c38645294a006db8c1864ce6c733f02748ee3ed190bfe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, containing numerous external URIs. Several heuristics indicate it functions as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=wwe+2k20+offline+game+download PDF link annotation
    • http://buyo-g.net/userfiles/file/wigim.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/putupa.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/31059594619.pdfIn PDF document text
    • http://freetds.net/userfiles/file/furexovofuwisof.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/26750286266.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/71331281415.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/1709693811.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fuzutawexatedirusude.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ee49be84---20887286072.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rejat.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/luluvilawamun.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/66392062985.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/84463393974.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc9f6a41e---54176688030.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a02a47fc7443a2125bf3fefa7523b368/35990060383.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/29871658559.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/69917004121.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tupififalifoluludadexiz.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2125c2fd---sirenuwisipo.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gijukanowafiwijanor.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0c126f004280c3ec09f08974238c8806/midemi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c8bc1c5b---39417521679.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/59045068771.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/87598230236.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18300 bytes
SHA-256: e811950fceceea995fad0982a365826ccfda9177c705209891d728995f058c6d
font_01_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 10744 bytes
SHA-256: ce1bd2c03d421110a05431758ef7bcc567e449818479802c7e294cc1c151c975

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