Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b03c30af0e852…

MALICIOUS

PDF

66.5 KB Created: 2021-09-06 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35cd9dcf34e69176be44ba1d4608cdd1 SHA-1: 79571a3cfbcc613d0d190740b66ba09eaa288180 SHA-256: 745b03c30af0e8529ed78c39a5f3419eea8e2d773f404a3cba54c66dd7a0b7a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The presence of embedded URLs and the ML classifier's high score reinforce the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://oniceh.ru/uplcv?utm_term=pulsar+apx+oil+manual PDF link annotation
    • http://srsheicha.com/uploadfile/file/45204022243.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jemoxine.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b108b118ddf---38617199981.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/ruzaduropej.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/52428194934.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869be442288---batupexerokakewe.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/41383617028.pdfIn PDF document text
    • http://qzgj.cn/upload/file/bigiwegelo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nudadajusebemomixo.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/lodupuloxadavaduw.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d1868b49da1478d06eaeed3c0c36e28/xidon.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/22244357204.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/38281278688.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/selubokenadixu.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zodatefiwewibomar.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/rudotuzezavilafiniziwikon.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb10a2310e---nedikodowa.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/38100744241.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/napusosixotofegik.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d38dd902b---xonodakulizopof.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jinoxaworuleretoruvin.pdfIn PDF document text
    • http://itfind.ru/uploads/file/30254001093.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210703025127.pdfIn PDF document text
    • https://led7.ru/file/6923825835.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/34222208480.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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 10388 bytes
SHA-256: 12a2afb4fb4a8f25ac636ece8042cce9a3f67c2237bc27296e6e3f08c164e94d
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 17408 bytes
SHA-256: 691dd04d585418887a3039bb34cd8469d64f52a8a830b0ef614c820dda1dc375

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