Malicious PDF — malware analysis report

Static analysis result for SHA-256 f580a279479044f6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2cfabee4c3638a6e195dc1b50ff01bd SHA-1: 39a8c84c78a3a3161eff1619ca3dc01800d2fd0c SHA-256: f580a279479044f64440afd09ef956f965d2608fe51f3ac8fa237be3913a79be
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://galantemontagnana.it/ckfinder/userfiles/files/18863615492.pdf In PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/79983072589.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ab2b80e54860d2b7ae88c637c04785a0/winowalakizujipizufanafi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/61939523118.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/rofeniporafe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8d9448b0320c4e5ea99c781848b01a2c/89207827672.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13605504394.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/14463323743.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/82107145086.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608141b981ce6---97901749720.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b6e355b4b---vokubusoxetawufan.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/rikuziv.pdfIn PDF document text
    • http://starsunited.at/upload/files/31309808750.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/90348505767.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/47774055661.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/elpv084imalvqi1kpu7vc59n6b/43907041581.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xijaxitizebido.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/9589389381.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/dijikamirun.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd178d08c65---19908590743.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/niwaveriv.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/ropuk.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fexakavizuperagir.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wejalutek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=development+plan+template+pdfPDF 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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 17424 bytes
SHA-256: 5b6a5e2c9d2ea7e2a5612119f4e7c40961c313a3006016f5cc7f1a8feb48fd33
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 10368 bytes
SHA-256: 40a6ad4ecbc79530a95c04cdcb47f6743e63ecd62dc510b4964ffffc3623201b

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