Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25a3b970f3dd6cf…

MALICIOUS

PDF

73.7 KB Created: 2021-07-19 16:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 799ba14aebf92dfeb0df74f96b2dfba1 SHA-1: 793aef7b210738f16bfb467f76f8e39c78d463bf SHA-256: b25a3b970f3dd6cf7c81ee4bed6d93405cb03ea7fbd6308194d9844abd929317
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it contains a link farm pointing to multiple compromised WordPress sites. These links are likely used to distribute phishing content or download further malicious payloads. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20514a89---tifotiditeto.pdf In PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/69074298075.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16a1739057c09aacf289f98c5c738553/zosizejatipaserodaxo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607018f68b9bd---wozup.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e9fu1sou93u2rukjsaud2dg7nq/6945743160.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/torapota.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/73598246905.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd8314fb7---6371681972.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/59821697287.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/3152435943.pdfIn PDF document text
    • https://2acontractor.it/images/file/57520422947.pdfIn PDF document text
    • http://mlight.cz/archiv/file/41656292453.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f593c1bb8d---95743156723.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1a2bb3fe4c9a6fb5bbb7c3f39cb2d635/jizudidiwidazosoboga.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fqa0e57felucbqfb306hggsdk0/69559044086.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/76953331010.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/07209a5f4a465054f94ada0afe0808cf/5128827722.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b770e3a92c0---96823512270.pdfIn PDF document text
    • http://azizolace.cz/images/file/zezupajaxukom.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/girukelepaxidoxewaxoput.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/rifiwoluxinepodifivizile.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/69f8a150546e3157295b978e6174b74a/zavagazomodovesumo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/94872310366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=oxygen+desaturation+at+nightPDF link annotation
    • 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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10820 bytes
SHA-256: e23740a3aff4e71340e74af46949ca4fd7ce22bd6e70fed4e6dc1786a8d5ce12

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