Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc139e2249a2196…

MALICIOUS

PDF

64.0 KB Created: 2021-10-09 06:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84d9e061cc2e4020764953f36eaa778f SHA-1: 62c67b7e0eb806d0f3e70e4e2c9f668b0b952a47 SHA-256: cbc139e2249a2196a5e435f4b5b961ca1ba5a07f227cc05c50fcc4e97692ff95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple disposable hosting domains, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The embedded URLs are designed to lure users to compromised CMS upload locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea79d6495---98378232628.pdf In PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/21130010411.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/gobukerutoro.pdfIn PDF document text
    • http://sns.hu/_user/file/90380173444.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb344cf18---mewunawom.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/76238199650.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/botovixobamokal.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/82701765776.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/belalorepokoxanaruk.pdfIn PDF document text
    • https://parc-hotel.info/file/24989776435.pdfIn PDF document text
    • http://gazetavk.ru/img/file/natil.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/wiguz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159a6f7a0cfa---mizedozodaxotomerenuxe.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/65955111940.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/220039944.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/pawamer.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zosijolurepuzebosujowo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pedodutodimivukosi.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fasonemezilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=in+love+and+troublePDF 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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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