Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f6033eea66c665…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 02:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a40e36b88db2d087278be25a76f11dab SHA-1: 874942ad68142d3550be18777f7f0f42c923c766 SHA-256: 03f6033eea66c665acd693f1553a511535c26c12233bdf63306de1af10985b49
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://graviroz.hu/ckfinder/userfiles/files/89761666762.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c004c8e3f6d9e9576983cc1c943b82a7/81342521191.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/duxokudurenoxa.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/bavufolemelesukazeduva.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/kikivikusonevonukusuvox.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/bobovunadazof.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/joxavekuxuxopujif.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f46379031---95447370326.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/ponuvafisuzefoxubulufimo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lnk7gbbu39th7bn2iapohftiq0/44312562177.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/gurupomegabarilejov.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/25950547137.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/zoboxigigobagoti.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/52194740796.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/23845150859.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/85249508106.pdfIn PDF document text
    • https://vitanov.rs/files/11871575698.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jazinuziji.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/22857896151.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/94378137621.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/niwejiwaka.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/59065657491.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17d613cdf84eab4a31e3651d4ded053c/jezirerepinikazokisuj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd36ec992---17332981874.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161426dde68bff---tonalixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+open+world+games+in+play+storePDF 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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 10988 bytes
SHA-256: cd77c2687975a0fd0bfb2ef593515114cab1d622e05e7a48ff8ef3ce6aaea60f
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17680 bytes
SHA-256: 2e4000c69a1dd56bddbe97753e89846e9695242e6ac038db31a73785ea5b2082

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