Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bdb8c29875016b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91b438d9e2015f5ece675aa2df220c94 SHA-1: 39c2eda22c7dffd9ce81b0c2ba3045eaa7ee34cf SHA-256: 51bdb8c29875016b64c3fa33eb85884f92221dd15eb15505d7c507f12deb9b5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/koxedefodamobavuzaluga.pdf In PDF document text
    • http://aquatherm-graz.at/files/32573847009.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906194635_wmr9ya.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zimupibuz.pdfIn PDF document text
    • https://0900107678.com/upload/file/jusezug.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/59875347550.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/591bb5da813e7300a3fad134c5e5e75c/pojenuvunemivadixikijexe.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210912/16314462938593.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/popavebemaputonedozogivam.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/95121477097.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/43379569993.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110e12edc9---51265068997.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/zamixagakedefapo.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/mereminiboralorat.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68303710238.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xilowob.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/rawuwanevotarep.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xigepuvodowerusakulemef.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/mibutezanesi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161344ba5a7236---76405983939.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fedejujetuxonubasomugused.pdfIn PDF document text
    • https://upaspor.com/resimler/files/dasalogewidadiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=boyka+undisputed+4+full+movie+englishPDF 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 19048 bytes
SHA-256: 5314843cd2595eb3d5da79b7f08d5d567296851dc11a602f888e329146280b71
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 11348 bytes
SHA-256: e972000f0540acdc6c9238273eb256dceb428d6ec0c478d3012c837967e2cbb3
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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