Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b61c0352f56b1f5…

MALICIOUS

PDF

65.1 KB Created: 2021-09-20 16:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f3e751c674f10fe0aeea6f8f3fef412 SHA-1: 59c1a992a45c70b43b35654473befb9e221becb4 SHA-256: 6b61c0352f56b1f56d6ff0a6fd95976fce0feb48eca69d4da971aea0d08be703
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories or disposable domains, indicating a likely attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

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 http://uralcomservis.ru/crn_fls/crn_files/mexavus.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/35531426047.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac1b6370c---tatazozeworapuxavi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/digeluzimoresekevegoratul.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/tetopeludubawutobu.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/48099140008.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xomivulajamutuluwux.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pt9k1ive5s3u1r6b51ijbm97o/samixib.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zebakinuzagixapegegit.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/fogimefajumeninetexo.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/97047271694.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/subajalanuwolarupan.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614882a9be2f5---77572629289.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210909233019.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/35317033730.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/demigo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/96809202239.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/38718227278.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73666486035.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zobagirak.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/91230752041.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/fomixu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/letuwumavujami.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219544973078.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bovalagipeworofipota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chal+mera+photo+part+2PDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 10304 bytes
SHA-256: fda30749157a480910b338f035bb663465393017e961d5057118046f2c6450e9

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