Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432d5866879458f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 23:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 870c47babf8445864c27ebe6bd00776c SHA-1: a9d03611fa39f7bcb3d568ad2f0c1f6326bfeeb4 SHA-256: d432d5866879458f3e2e5f7ca10185bb94ff53a86478d8adc2bc74543df1959b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites. Some of these URLs are hosted on compromised CMS upload directories, suggesting a potential distribution or hosting mechanism for malicious content. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://coronado1977.com/clients/54390/File/zoram.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4b1c02ee3---wekunijulijavuzonisun.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/86732553627.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/82045304727.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/22007886859.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/53418363426.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/limugobuvozuvedanaw.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/30480612980.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/liwusunofovusadogejusapem.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vutodajisosozifugovabuk.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9a8f325dc6d4ff48b2772ddcb2db2973/44342724742.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9ff37cca5893d0d901e343057f48b736/niposowiwoz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ef6240f3b3ef07469a89a9499be526a6/walepivaruv.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/gorudokiravopit.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/giworimumebugekumima.pdfIn PDF document text
    • http://midel.me/userfiles/file/jogini.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vu70ovgtfk9t43g3ecff1r71b0/jokovodoso.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbdd8572c---wekikaw.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160cc952e276de---siranugutoponojojike.pdfIn PDF document text
    • http://erictex.com/ufiles/files/sobavogiruva.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3457fcc3e384e76e5fdac97ac85d4c02/94351205667.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/cf467e095925e37b5fb144622c30c048/33158809521.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/63263115715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=register+in+sociolinguistics+pdfPDF 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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10776 bytes
SHA-256: f3c4b9ca6baf5637e407cfa639bce4a9602bead24ea16cd2d5f776b7d059686d
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 17564 bytes
SHA-256: 5e8fab7d87b72ca10f315927ff617c5eb577f8775b275548d95eb8c632f9ee76

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