Malicious PDF — malware analysis report

Static analysis result for SHA-256 08515264cd22009d…

MALICIOUS

PDF

78.0 KB Created: 2021-08-18 10:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fb1d138d5296fd74e3cc9ec30b93776 SHA-1: ea60a56d18b79975313257d8f8e19d31fd89782c SHA-256: 08515264cd22009dd27f0a790f1d14a628c011feea8167cf809bb9d51be18015
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7162

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://tygodnikzuzlowy.pl/ckfinder/userfiles/files/lajok.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/833bef97a9e416d73cef742c6d16a2c0/87384190410.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae6811ad8---36531510964.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d877b93a2---6354849696.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ab13886e9---kotidesufudirupano.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9aeb9f61da12575d6c82829d5d0d44a3/24772671393.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c0e466a5---11629991168.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16112d87f5ef06---visil.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/31576653526.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/293329bed1c15cff0e4e1d72703cce58/joxir.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/47cad14f06dd88131c6988484e56c702/3713218572.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/37139385994.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kexikexupesapixepoludibad.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/15543990197.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160788de092b07---52148946908.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72e282bad---35334341760.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/37826066267.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/lemovigizidigosezebajup.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/hl95av2l3g7tmic1jhi7gmcaj7/muzepapevi.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/2309555343.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/sogewosafiwamadewukazusut.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909e4e080e2---28610611954.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210702054318.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/70d6237cc6065ca91aebe8e76cd30201/31405100591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=amazon+kindle+fire+hd+7+android+versionPDF link annotation
    • 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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10768 bytes
SHA-256: 04ff858b748cf08edddcc0fd5b8801b9442d5fdeb96fa2e037f2cb57a0abcb35
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17740 bytes
SHA-256: 1873c06391f3bd26ab1ea31dd4b4d4337730120db8a53b5885fe67c76016e7b9

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