Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffb89729fb0970c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 04:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fac260c6fff30e53b5cefb20a0b356f6 SHA-1: b0e48437bfb9d4f6e0b93079fbb70f07655c49fc SHA-256: 4ffb89729fb0970cd77760ae6bc588755ffb5cad35dcd16397f50a11f527bac0
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8021

Heuristics 5

  • 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
  • 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://smartstone.ca/userfiles/files/gisufe.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/vifemigowiwodemerosu.pdfIn PDF document text
    • http://bushurov.ru/images/files/91243447595.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/edimiwajujujabenojereto.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/91633933877.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e5b82dcc085532d5aa014889f477805e/76251460448.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722efa23e86---32724242216.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/20021048518.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255686e449d---69151407087.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108101806346316.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7f447bd4a1ccee1857c5a60649fa6978/67114374269.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/27913684591.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/10695429842.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ajc2m3o4nharvu5rc99lb36t66/lofizuji.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/76b59d0b4ad1e8c89a43f5c5f84912ea/84731462244.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9277d1b9c5---zodoxumadijukabaxakus.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/42582048730.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/60377163669.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b58969b3f---72241141545.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/132d82f976d124330ec3a9a66ce5a281/mawumilodeki.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vefaporizine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=icd+9+code+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 18716 bytes
SHA-256: 43ac502f36e0a4e316401b931e914c897bd37988f6ccc15dc660bde99d029b0f

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