Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e10a7aba70eadbb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 945a1441bacf629af02182ef72a57f0a SHA-1: 86b393730b4f6325b51be32d4e3c766abb0efe68 SHA-256: 4e10a7aba70eadbb0acdf8b1b580137d1931ab22355ddddc3a6bd377f97a4c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=define+workbook+and+worksheet PDF link annotation
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29e4da2e1---97634384734.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/13244e8cb7b58f44860fc18bc4d5f8b4/62076249859.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f4f86c5a080c3db306b1a23f6b6e8d50/28308940245.pdfIn PDF document text
    • https://tigapilar.com/upload/files/68931714102.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/38848259983.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec92bfa3c---55500032492.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5cd0717dc83fbde45c07273d3bafdcb9/pufibifofijofuzo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/13368772887923997c251919d81078f7/71564122206.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hvhvbcobaudp3fmfnkolrtj8dn/gumosower.pdfIn PDF document text
    • http://prestopc.it/upload/file/rokaguno.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/runesexudit.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/653d3a8c5f32ea5f23c7c37d6d4be7a6/paramovegazulalusapug.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gevumedixexufemajuwa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b641ff69fb1a4385670024757de2dfb1/68714207842.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/buxab.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/52ec8714bf06dada66fd33a5d46573ab/pajirijuzepobidigajevadox.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfdea899ea---59278311840.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/21220821749.pdfIn PDF document text
    • http://cutskytools.com/d/files/65550457945.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e714342ced189a5b8a090a9aedff05e2/70850734940.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zufisirejebewaxorizowutib.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/6074240364.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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 17508 bytes
SHA-256: dc5bdad2d3299365dcb3207ddf404da83b6fc2a0255506678b48b15842d7a623
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 10724 bytes
SHA-256: e365c429f876e217de4e87d03ac4c6d1791e986e51d204e33461aab012e775b2

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