Malicious PDF — malware analysis report

Static analysis result for SHA-256 6628f81e75ad601e…

MALICIOUS

PDF

67.1 KB Created: 2021-09-02 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6787e0b2bb3e3b011bf9cbdb90961adb SHA-1: b3cbcf290fcc7505db2e5269578eacc9233cb703 SHA-256: 6628f81e75ad601eb5a13bd86bdf8c6862bb59f15ea5fc8863d96f3ab46e88e1
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6095

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://bekkercoon.ru/ckfinder/userfiles/files/jupabosevituridawidedov.pdf In PDF document text
    • https://olterus.com/contents//files/92387527702.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/2062574233.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/tugagon.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9fa2e6643d27bb1d8edc7d277d59bed4/jakuteguziwud.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/letegavig.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5tsvsb0oo9hm48tf4eb80obp15/91033845648.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/mobavufesi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bebemopodofawupedarovaf.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161168a34c1ea5---fumizesukekufapix.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/21256748180.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c44d74fd892ffc82cb0bb6afeead9c9e/63997368593.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/71911828124.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/48997608638.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902082528472031.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161257e770748b---satoba.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc75cc1a4---tifilozebaba.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/tovumumeladorijifosapen.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983ede482be---63044752791.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/61257994506.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/46fa3c5523a49455e5cf08be3a5e22c3/61417170562.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba7fd83f5---tasisuragelelofijasanejog.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/ragipidenakokanozafuj.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/junowele.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf188a8e4---kififi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=steinbeck+the+pearl+pdfPDF 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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 15728 bytes
SHA-256: 1b09e1106712da5b48f0ce518c29049c57521b3bdbb4a5dabc08d7eff8255878
font_02_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10736 bytes
SHA-256: 68a2d718c6bfd2a9e98247b9618c7563f8c0505238bd253be8744433c6086254