Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7e0d28ea9adf3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 17:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efcd603526ac49fa875583baf1cc0b7a SHA-1: 3f84fb0b7e87aa9998be8268f8f5f8ef1059d31d SHA-256: e7b7e0d28ea9adf3d82d175ceb2db81b36350f5dfeb717d341e79454b0365c53
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab792bd172---mezebebawanemezaba.pdf In PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/55525138613.pdfIn PDF document text
    • http://htwy.com/upload/file/mudusaxulujideralotipexug.pdfIn PDF document text
    • http://screen.by/images/file/96674213529.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kugusatogejiw.pdfIn PDF document text
    • http://myesen.life/userfiles/file/segirozidiradez.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996edb58170---tobofuwiwulokivibozi.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xexiwovebuvonotaxenivogek.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af451de8983---fiborenixuwegivukopi.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/43118259868.pdfIn PDF document text
    • http://texmet.pl/userimages/file/tidimazajuvesomaxub.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78933188473fe71d901f2b92d3da61d0/renixu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210623_FED4103E1169AA17.pdfIn PDF document text
    • https://orangerun.re/photo/files/73787282219.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/zakalod.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210809_378368464B5030C1.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8531524ab3---34835310459.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/zadupoxo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095df3edce11---dijidawapojijaranukel.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609124ce3299b---21714285298.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/litojedikax.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/xusubonapaborikelojab.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/119ea0a4ea0dbd920fdc4301c1b1ff2d/mapukamavixevanatow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hebraica+stuttgartensia+pdfPDF link annotation
    • 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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10860 bytes
SHA-256: 5ba4d975a8d13a394ee6e5787a677b37faa0d70064b289d143d17faad07b457a

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