Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a115451345f1e3e…

MALICIOUS

PDF

63.6 KB Created: 2021-09-04 16:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e41dac3ee8c87eb683090a5867d1453 SHA-1: 48c709fe0cdbf5b149dc9bd2965b22524b21a9c9 SHA-256: 5a115451345f1e3ec925aaa58232230318ef205c2719ad94ed637cbdf496ac51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8045

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://thietbiytedaibao.com/media/files/nazadaniguregudo.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb17d68ca---15203547275.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/92372392060.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/luduto.pdfIn PDF document text
    • http://heureka-cz.eu/files/tugamitemixamij.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/wumibazufibenused.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4baaeddc658ebdb54ed6370c2c0e5a06/36218469763.pdfIn PDF document text
    • http://camonetinternational.com/files/file/13701761606.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/epm1vmmcl988b9e7ok589hut05/rugubuwexudol.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b884310b897---fetajisuzolugadexazilaxu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/72042123370.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cfb88c0a9be087b09764d5adc9248b11/sawodovo.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kanidevujomim.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612369df1e4f7---71458783599.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d8cad44dbec33431a663429c0c45148/69540188523.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0255143d6---fupudusefitadur.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/puvarovuvutunufal.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/66458575302.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/wisijitugabuvuvaz.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sufuwulavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=reproducible+econometrics+using+r+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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17660 bytes
SHA-256: 710df40eced0adaeb660f099f9124169a0e224b2a7db34ecbe0a4ecfe2faa617

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