Malicious PDF — malware analysis report

Static analysis result for SHA-256 e055fedbce43bdce…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 12:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7bd0d45104e794cbd583085c3d90436 SHA-1: d2296294644e72484b6a8365551dd0c5b1edc695 SHA-256: e055fedbce43bdce0163211e7935f568491b51e6bd5e134ed7162e5e19682214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The heuristic firings indicate it's designed to lead users to external, potentially compromised resources, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=two+alloys+a+and+b+contain+copper+and+zinc PDF link annotation
    • http://alda.pl/ckfinder/userfiles/files/61596814189.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/kefakelufepupegisafol.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088289c9cb77---refidusakumuborokopad.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/26123825834.pdfIn PDF document text
    • http://ccsl.asia/files/zimakakateganuke.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/ruwoziritovaxowi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zadefuvarenezikumoxidabaz.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/murimasunofosuvun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f684dbee15d---bukavoleremosari.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/73020528740.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/41039423928.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4rurkidhrna5tq2hjbi090l29d/pudujaboxexa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b85779d2---tinadu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a5cba96f6b7bdde7bd63563d0c1e8951/61972854897.pdfIn PDF document text
    • https://cape-electronics.com/media/file/50187996970.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c312a4c72---kegadofematunuzijokisopa.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/po7ebovvtgahj876lj8dbt5db3/5665145230.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/79364139257.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/9564111655.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gotarerazaj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76e96c982---xagiduser.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jugusejosowigutinuj.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_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 10868 bytes
SHA-256: df6e934c0769e763c3ea1ca50a9189b66bc6bcb893b3d761908a5e011c6861e8
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16952 bytes
SHA-256: c4564ce28d7ff38e073c3d97cc09534ffa6f45fc5aca7f30eee1e4bc51567be1

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