Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a628bdb99d7587…

MALICIOUS

PDF

74.6 KB Created: 2021-10-16 16:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8bc85697f5de4cd2e11e8f779e08f86b SHA-1: 17bc74c6eb567ee5ae9a59ed877a8df87607737f SHA-256: e8a628bdb99d7587defa847401d10b92822a6ab2cb0ad8ea405c8611982a31f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://magic-ray.shop/uploads/files/29577422103.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffff02beb8---ravav.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3f40204e261455095fdabc480c291a8d/bikirofafovuvatilil.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/budosudubakutifurovax.pdfIn PDF document text
    • https://anup.bo/images/files/duraribixobo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16152cb3e052e9---dimoferoziputawor.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xuvebaginuv.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/871a2ded2e77d0defcf9c1679513e49a/28071894953.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///11406943885.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c7df3ff03---87428917649.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd4aa7c470---61616293747.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/39933468719.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/vekenexevuxok.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/57537524527.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/67271293463.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/99875928320.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/bimokevepud.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/kufizanutiritilodezifep.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/89673147449.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6b4ce729---67090872862.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313cb668b91---98966633763.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/bigonezedikanonizoboweda.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/bitaxesakexox.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=standard+enthalpy+of+combustion+of+ethanol+equationPDF 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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 17752 bytes
SHA-256: 7fe93dbf2f01af42032abb6d002e105445d96647b6291f8b1539488269e0c520
font_01_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 11460 bytes
SHA-256: f67c704e98f5ed9bb1403ce1a26fb7aad57c33bb347438736a19650a3a25e46f
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1