Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37ee4284beaa974…

MALICIOUS

PDF

94.9 KB Created: 2021-09-16 18:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16315f9eb6d7307a50122b954cdc067e SHA-1: c814c629424b10a44e92125533ca9ebd9d3b8e7d SHA-256: f37ee4284beaa974311e34fb4f9d3715d9b2835ed4c5982df5902b842021f2d4
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ms2oke.com/contents/files/poziparor.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6d38cf35---butupobasoxozisanuwu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gukobufebi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d122c2078---32329030566.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/61469152965.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377cc8e18b4---14636696165.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kebovebov.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4560886266.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/pavisilemegikuk.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4941c2d0---16028656885.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dipetolejosolak.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/rufekajotasinenibukulo.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210901_004553.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/pipokatijamug.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/20288991849.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/jafebifenisoxoxepixaj.pdfIn PDF document text
    • https://photojet.net/userfiles/file/sinafenokagiferowepavuxim.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/zefofolis.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/29671932949.pdfIn PDF document text
    • https://podimercrm.com/img/files/16282209236.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/31041577217.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/77179216973.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/lupajijuzawokuzakibinowu.pdfIn PDF document text
    • https://interconformity.ro/images/file/73656854729.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/77726375733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=video+editor+gratis+androidPDF 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_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 10344 bytes
SHA-256: f3c16d5cbe84eb0afcbeb2fcd52675a64e103e0a00ed4cefcf46f7d78b5503a6
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 17548 bytes
SHA-256: ced01c44f6aca464dfdffd9c12c49725753b7f543987ae24ee112fccb00ac5ea

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