Malicious PDF — malware analysis report

Static analysis result for SHA-256 18505bc3ebb2036e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 23:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d9b0aeee895daee065206cac0ac5ea4 SHA-1: 54faa2704fd7997f3d5be47e357aa06b4b6c863a SHA-256: 18505bc3ebb2036ec0f359399d3a77e2082cdce9f9d1226ce663ff971dadd7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are associated with compromised CMS uploads. The presence of 'utm_term=oprewards+free+robux' in one URL suggests a potential lure for users interested in online games or rewards, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5179

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ketchas.ru/uplcv?utm_term=oprewards+free+robux PDF link annotation
    • https://bluetact.com/locktactyuma/userfiles/file/vemekil.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mujilimu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210924045656.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901050539.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec7372ce0---xoteledixelu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/77792020002.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/45766870379.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/tatevojoduvufofilufa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e850bb9960---83026182510.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/67317193189.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210923_003812.pdfIn PDF document text
    • https://argumentua.com/i/file/74967688078.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/pudobosugibudusubaxigu.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/1460741274.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/30805229418.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/50459539402.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/jibutedip.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/bogevuvaniludusuxutu.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/10127270423.pdfIn PDF document text
    • http://twilaw.com/files/files/totike.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7e4evlsehhnrrkgkjg5uo1bsri/tamenazukexavo.pdfIn PDF document text
    • 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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 17880 bytes
SHA-256: 0c64718668486786604509ea3750e9dc1f772f8a4f88e7deeb91f367733480c9
font_02_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10604 bytes
SHA-256: 9b51c23c122327e58a5cf3792ece3e591f6f59bb78eca70591817bb5fbf9d017

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