Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd59d596de76190…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da8d4c8f5252f78dd7321ea6223f3851 SHA-1: 0c29aa98ff51c3cdf8653c2d687bd3ccdd7e43ea SHA-256: cdd59d596de76190baaaade60e615eacc42840258193ace8a8dd7853294787ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=football+2012+games+free+download PDF link annotation
    • http://minhnguyenvn.com/uploads/userfiles/file/66737984881.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/21664813938.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/54705706123.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/47559344184.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/xijokuxulegivorutipi.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/73833050182.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/rojesavubobawabevapu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/82113023869.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58547213287.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141144727b32---mikaxizujaj.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3a03e49ed32a06db97deae1454cebf38/benegarapoj.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907070942.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/29578010832.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/denujojibazopalowafonexe.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/9421816085.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161377b6ed295d---61769898003.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/baxat.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/ruzititejediw.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/35807373906.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141125e03719---tufid.pdfIn PDF document text
    • http://identik.hu/editor_up/60926917214.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/16293964165.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/94614900649.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/komesexob.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/52037294473.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 11104 bytes
SHA-256: 3479a0546bbcfa37fa72c2fa98375d1b9c7f425f7474522e0b6c01db3259adf0
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 16332 bytes
SHA-256: de566d2bca5bf6f0dd9ff7f9a58fc2bd27d3d5be62932be0c1a8c2a6fd9490b9