Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3f30c4396bf164…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 03:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d9178c272d53cfb85c49fe7994fa86d SHA-1: b94d11998d8320770a3cc30a572957b490f5ae09 SHA-256: cc3f30c4396bf164162a79a4166c2e37b9a1eac393c68c807f33442214d9b5ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/91953729880.pdf In PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604025430.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04652ed027---3652040035.pdfIn PDF document text
    • https://ckmandarin.com/uploads/71379543186.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/88547749572.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k1poea5mvhh7153t18u0qlpu4o/59614987845.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/36827b19f331bdca6b8087e97bb9fd2f/fejujupumunixuz.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/bikofesonupakuweded.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tikatulifirixavatimumijak.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072937936121---vesap.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6ae244f911b08a6fb5f1b7383fa7dc36/bizibevozejopavumedid.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/zozomufuluwifemexixu.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sotuwukapobovawejigu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/fewajesomolemedinomibewo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2mkpaj5mgu50tpqlnj1nkqjnrp/sanujis.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/26262148619.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sotunojanikifixuwemapu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ttcc15t0fosnos2s9nhm0h77fp/34385448267.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/37748331869.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080068aee6d5---53131487944.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/5879289430.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/4989011866.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/37431070200.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1185f2e9ad3cf4060f720cdf2fd6378e/goresuxukuvazikupufukokiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=participe+pass%C3%A9+avec+%C3%AAtre+exercices+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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10824 bytes
SHA-256: 8ac0db1781d95befdc4641307c2f55bddb609391c5d1dec0327f73cac6a862c8
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 19008 bytes
SHA-256: b80ae1859db4993f299603a6182d2f25ed461972e10840607e1216a3a9c291e0