Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8d8f98a5250f1d…

MALICIOUS

PDF

77.6 KB Created: 2021-07-15 19:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c4b2a93fe9b6c059f02fa5fe8f1c980 SHA-1: 40f0cf4df4e0cc5979f1b9493280ec50b3ef00e1 SHA-256: 8c8d8f98a5250f1d6362bbc77dbc5319ec160e26d65d8df00fffc141a1e7d82d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6513

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://krisoc.ru/uplcv?utm_term=how+to+make+java+run+faster PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607173fc65a93---70929690791.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/mozujudozakixejijik.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6502fe7fbdc624f47681e83b8ae54e72/86551480881.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/43908044996.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/95936202322.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cba28ceff---xazazonilox.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8d4hsilj6la5qg88lm381kdgvi/wuxodobakidaruwadonavug.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa29b95a5---85915851554.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/jobawomuxafetitizuvatugak.pdfIn PDF document text
    • http://sakem.org/userfiles/files/fakome.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0194003de054ae309753253d6747b3c1/lamexopawadugixokus.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502051642181707.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1eb25df22---titap.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/7421299742.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8b5e56cd3291415318849d1cdb9e4f18/69842081331.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/fukiwesexugerepidibino.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/bawamamadepavunifopalo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1jl3jtqdcc51774cv92elu4m98/xoweguwakemorewos.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/11666443611.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/lapozekukekiviwa.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/fojojizatoni.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gtb70jeg6me2rtnoct9ijujv80/38424916112.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5bb58787a3ea8b606f189b87031760ad/55509973412.pdfIn PDF document text
    • 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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 17880 bytes
SHA-256: f138d4a537feaefee29aa84083384f3970bb8362f5fcebfedae4d32c47eefc80
font_01_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 10700 bytes
SHA-256: 61298ccf2ef1ce5ac3f04e68853dc58451936da09e686d0c0e38d63d83dd65d0

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