Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8f3ec793fd7806…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4daa4077f5323677f9b74aaeea61f396 SHA-1: 81c3e6033867a9ef5432a64794d304733b559fe2 SHA-256: 4d8f3ec793fd7806b35aaf20f4f0b92c1e05ed2a06631a26d1a6f69b12c7c4a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8022

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 https://laborke.ru/uplcv?utm_term=how+to+manually+flash+an+android+phone PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6kivmj05sfltaf97onbq1cv7v2/mewupiloxefu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bb4d975aa872ef11a79b626441093d18/36687613806.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/5020664812.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210906042212.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/36665765159.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/52552866328.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d0a949945e2b2bb596dfb386008ba3c0/furamujasonejovuk.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/simogas.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/fimutirapira.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/881779208.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tamazuxolunevibebimenoz.pdfIn PDF document text
    • https://coil.hk/upload/files/18814881409.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/ninotasivi.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/38616116358.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/19155058577.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/sejos.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/12068416510.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_AFF3A3027036AC0C.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/43826042300.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vobisefovadojenoviledux.pdfIn PDF document text
    • http://fygl.net/uploads/file/041433204205.pdfIn PDF document text
    • 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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 17620 bytes
SHA-256: 62b70bd91e8063ae1c95d6c1662c7a01bbdb37a0439c4b7841adfad7f261f725

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