Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da2092fb30e333…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 03:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62a7d80ecd9016fabc613acd7884fed9 SHA-1: 356437205bbdadfc4f1af834868a2756b24996ea SHA-256: 26da2092fb30e3334f5e4e52117fac2e04ee132e5a29c06db495a20c35adf2bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=boss+pressure+reducing+valve+pdf PDF link annotation
    • https://equantumconsulting.com/files/files/fagigolevorimuxudepu.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/99083646540.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5a06d460---jozuxitafudofinepege.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/907a566217ab3a174e53c52995241ddb/55454166330.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/29648904356.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ejoor71c016dpilqhqsubb0tlc/dimaje.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ebc6dd4ee924c88f7453817772c25d4f/vabupoxizufolosogabuwojom.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ae02350a7dd00e75ac266ac7785731e7/labodasalapuju.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/soxifowevokuwurod.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/11552121396.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d414f7f8f0f1b22f95938279ad36fe92/4040853492.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/mivaraxajikexagokaso.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f81091a571b4c28fe0eb01aaa4d48c90/73746867474.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fb2846d1a---88238079089.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/sikizojatozuz.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb5592a57---fabugixikinerivovedox.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/70003634753.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/fomuleri.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160754587ca937---11105054210.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/61d1cbbac20b637cc175e4e6a117f744/21845319025.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b8880769765---mafabawizakiworasakozamet.pdfIn PDF document text
    • https://mmszke.hu/files/file/rubobopokuganozos.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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10916 bytes
SHA-256: dbbc9ba3e190eb2760d08d1467a4f72e8574fa105fd54e802151e1d352d349d4
font_02_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16224 bytes
SHA-256: be9001d89bfa45eeba3bbdc8e587d3f873d6cfe9988a129c8470d28708e12554

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