Malicious PDF — malware analysis report

Static analysis result for SHA-256 279952793ceded62…

MALICIOUS

PDF

53.7 KB Created: 2021-09-19 19:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41f0dd573f9cf47bc57f236b02ebf6a4 SHA-1: 77005a0845e2b92c75e65417db9d68adff593157 SHA-256: 279952793ceded624231216f9320dd3e56db4698a6ef8b7bb33cbb8cf62cec0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8059

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://smidgel.ru/uplcv?utm_term=new+game+android+free+download PDF link annotation
    • http://195exim.com/datas/files/vufegebasetevoso.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/40414797565.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/126e353a105126b3e57d29e6cdf5d940/8018818986.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xurixumerek.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/11884726178.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eadda2466---mutonizowuku.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/948388259.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16039822126.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e28afa43---13787056662.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/17151756503.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pidijo.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/gekarama.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/70459336000.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/nizevavugujo.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79882712815.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28955705824.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/85907466891.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fojilenasofuvuzetojapu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d63b47d2---dosegevononixo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7g6qodp764j5h2u4dgadt061d5/77437790289.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/rikujejowuvofobuwuju.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/miwewatafugasa.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/19384588767.pdfIn PDF document text
    • 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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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