Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd24d3ff30c76881…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2777dbd702f8c05fe1696a25d574a891 SHA-1: ab0eb3586b0edc99ece9152b31a7ac8a196d2832 SHA-256: bd24d3ff30c768819a81c99f568eaa4bd598ee77f59b29e60442869b882bf970
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8222

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://huntic.ru/uplcv?utm_term=telecharger+films+gratuit+android PDF link annotation
    • https://marwaservicecenter.com/nbloom/fckuploads/file/mofijobufasux.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/sikipexozudefatujojovabe.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/38248383052.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/65980226712.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/vanoxitadasubesuno.pdfIn PDF document text
    • http://mq-water.net/upload/kazuwakofukimobexejevenas.pdfIn PDF document text
    • http://wenxuezj.com/images/File/79575224730.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/sunonadovewiji.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/613e4abc91811c86d14c9e062f4c053f/givuxob.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/37aa475f301c20abe70390a031cd06c0/lakasomaguripunosede.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912145412803164.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/muwig.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/24162727180.pdfIn PDF document text
    • http://checopharma.com/upload/files/8989277660.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905094200951024kokhx04dwjhz.pdfIn PDF document text
    • http://charontrade.hu/data/file/kabibokidakemobami.pdfIn PDF document text
    • http://www.siposferenc.hu/html/rexewot.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/86956621719.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ebaa8731e28520074a7ec3369da14377/rabogefig.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca93801a36---duluzewifadixobafalixaw.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/72345847292.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/1098760826.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/jazamaju.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/68501103871.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/59461112951.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8e421409---siliwopagaginameja.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/kijarerudizedun.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/finigutimu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10984 bytes
SHA-256: c4b2ad67931e2e556704725de82951956110f63d44d1ff1ac5a7c1ba4b15fb13