Malicious PDF — malware analysis report

Static analysis result for SHA-256 389cf54d3878746d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 07:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b28fba35db4d2f73d25bf8181623f24 SHA-1: 39d0d0492848fdedb339c2e138ee75c52204dc14 SHA-256: 389cf54d3878746df571bcc1ad402d2412aabe03bbbf1f0f0a143534aad3712d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=falcon+community+medicine+pdf PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/62382122850.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bphd15g6aftk234qsb7atm3vhh/54070798684.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/butatipajupajazepexoxotep.pdfIn PDF document text
    • http://absigorta.com/E/file/94901616525.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/2d5kd0ei0fk0dfresh4laoutvs/32044267546.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c84863aac---44519694022.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/jinabekimabew.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kopezolixotipezez.pdfIn PDF document text
    • https://melz-feu.ru/upload/xogutizunupoxa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab93a4867---zasodujuju.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0dac72e6589f5a9774a3c42431e4ba1e/99815878777.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/dolabadidijezelove.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/42332278634.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/kagawinotidezipabemuwo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/lipug.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/99579583925.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/26715621429.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fm4atuba6qr9grsumbtuot4150/2691982757.pdfIn PDF document text
    • https://efnnma.org/files/file/22796032596.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/fabijozefabojabowulopi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781450bf32c---nalivusudupoxineni.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4533438c4c31835c3059b467862b6a15/3289436065.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_off0000bef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 18944 bytes
SHA-256: a7245183a6583618ab57a2b82fba5877c696bb21ca347fc9f27fc552230d35b6
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 10704 bytes
SHA-256: e12ea5e8a9b92232a34e032301866259c1ed70b9bd7bab77fcb9566fa7a52a07
font_02_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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