Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f88d80a219aa50…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 20:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 091f5963f5759bfd1a6017579cfac5de SHA-1: 7d1312b3f70069cef558536c789851a6b59d2822 SHA-256: a0f88d80a219aa503949901586fd3712a1f0d0628ca581c5ffa0284ce47c4191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload storage locations, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, compromised sites.

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://ganport.pl/userfiles/file/bobuko.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/99130654030.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/57923273844.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed108725cd---joverejudibud.pdfIn PDF document text
    • http://hankaebertova.cz/userfiles/file/9185923457.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/64426121486.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/18381848937.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/39572039543.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/61911213775.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161328a97ee5fd---78526785223.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/sotifigudavuw.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/78481911373.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/woliji.pdfIn PDF document text
    • https://fishuntpesca.it/file/53363269536.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/87478616212.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/87083927276.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/38639951763.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908033824657653.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/87154910984.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/87148462604.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136bef362917---76100590575.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/5102979156.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/larudipiragaxumogotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=connect+to+phone+with+broken+screenPDF 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 10612 bytes
SHA-256: 59e26ca94bf8c1237d571c8f194a8c0c4b5cd3de93d37e68d973bac138ced8fc
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 18000 bytes
SHA-256: ff1edcb015c16cd48d84432c4e2cad57870103e519ed2665f193f0e8836803ad
font_02_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1