Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcf341570408984…

MALICIOUS

PDF

93.1 KB Created: 2021-07-29 16:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d14b0e7aa7939696f42642a21b263bfb SHA-1: 3cff66823c94ec62e2c0a451be3c494ce3fd296e SHA-256: 5dcf341570408984deca62c5c9ec17793a20f9ba60831b897eefa441215ee1db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to 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 are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://zakarpattya-tour.com/upload/bizowikagebokagom.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/jivofalixidaj.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160951d25b62b5---sajupalamanokemaluz.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a66f33c0---zoxuno.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a73b5fdf9---20157141252.pdfIn PDF document text
    • http://wamer.org/userfiles/file/89329438591.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/af85ebc2602a0467b431bea08bf0f31d/bukoxi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e448f8613d2---wesepiwonakawolilujikufoz.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/xegetenaturugosonilap.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608095509e5cd---jupejalili.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/92757574435.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/94087125952.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/702352f8d061b190d47d26cf494c1cfe/11975652168.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee03add0348---bijaxulumuvu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2b99d0d7c5bc625283d8808302912a5b/fezudozizonumifemexi.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/temonazudulujojete.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bjh2d5dqogga2kle5ujkr83vbs/22653540173.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/h3pp8ct6bcihlqbhnrtpar1ur2/kaletitebupesukagoloxi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c9fa7fad---zuzalufujib.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be59b8e275---61426701755.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/4686458377.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/60566060489.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bfb5cb67c---bipuvaberasegaxo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608127125d8c8---50517101291.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tk8a1qtljak6uth793f0tt9bga/kanitenebugifesuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+cancel+gold%27s+gym+membership+due+to+coronavirusPDF 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_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 11492 bytes
SHA-256: e44a6ef0af49bcf2abaabfe97fd2d88d077747d3bfc48234f4744ebc78f6e093
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 17688 bytes
SHA-256: 6a3e0952e51e905735ae663ebd4c7dcf62f77d652d94630711f36a5c24b7eeab
font_02_sfnt_off00014d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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