Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcf5874720ecd96…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 06:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c8320c99be382db3e65659827a45110 SHA-1: a0ff18b58192fba22e9752081081082427183f37 SHA-256: 0bcf5874720ecd962b49899947538ff1ebb828a00462bf6ff997e8045a545d58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crewmak.ru/uplcv?utm_term=best+website+to+watch+hollywood+movies PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613165720411c---raxasesivu.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/vifebutuko.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f91c66ca8e120cd83cfceda6c77f555e/pimafuridobumazubizisifo.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/rebalo.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabesanatok.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vowagewulujukosuzonalig.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gumebuzijarawexakoso.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/63340240678.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/70487962971.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/genonufoniximuzujezizu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rukaxuwukeluzaxukusamide.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/8706214743.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/gexujenetamamovujinituk.pdfIn PDF document text
    • https://razredna-nastava.net/files/26226939524.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/5552177208.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/50849891247.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/32894923287.pdfIn PDF document text
    • https://botroul.be/uploads/48207366390.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xopufutitobegu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131447c5780e---lasewevuvedadaru.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/36818787290.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/jelajuvimosiwawiwoge.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zisufigebesufa.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nuzetuvolawufetegun.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/56679748400.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/disepanamonugeg.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_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10892 bytes
SHA-256: f76c893c6aca5fb8ce5f3df5ebeaca4fc5fe49b55080511afa0224dec82a8550
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 17596 bytes
SHA-256: efc2f2da0f757d9b195d13dae3f51c89bd07684db2090ac4b7ef96534771b5de

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