Malicious PDF — malware analysis report

Static analysis result for SHA-256 243f8238e06bf70d…

MALICIOUS

PDF

72.1 KB Created: 2021-07-30 05:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9c1b916d4aa381c9d4813a725f32def7 SHA-1: 7059cb298413b04a230561773af11c16dd25500f SHA-256: 243f8238e06bf70d202279112ee779ff0ed7c415e548810e1d0451807339df61
154 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c6745b53---80157724853.pdf In PDF document text
    • http://uralinteh.com/uploads/files/23619840474.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/lepobudizupukibuw.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522044210381109525.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/909dfd13bc85031960b287e2845c3fb3/6975802879.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/4620414373.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5436b3a5d76bcaf15020a55a45738be0/11479044563.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b32d1233e---barotajezerilo.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/sozumelaxi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80295baf2c---xonizowosure.pdfIn PDF document text
    • http://skia22.ru/pic/file/95903958842.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a3c56d93a---bidut.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/85599020100.pdfIn PDF document text
    • http://nature-revive.org/files/file/joroxepomumemeli.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/11006782348.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/nakiteperodomaxawebal.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bf17ac659ac696267045b0a0822014a7/vudapofuvevobalirevuke.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2a9e97be---64115666136.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b015d8925f0---voluxuzoseb.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/c83nb790lb7gjnua38vpe00fmn/nogatofegutagodav.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983f8d96ee8---71760333506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=b1+preliminary+for+schools+trainer+answers+pdfPDF 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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 22016 bytes
SHA-256: 173d243794a3a274095713e3bf35d83ad629edecc42a96efef16a06d50578853

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