Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0e52bb68302620…

MALICIOUS

PDF

74.8 KB Created: 2021-07-24 21:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e16e2f03d29059285528d4a16fb4e5 SHA-1: bbd29a1a30e9e99a379081887785bd73f17ffd01 SHA-256: cf0e52bb683026203b85219389f7a5ae23c3c93c63b5f3d94f512d03a7f8d3e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c4fc9764a767c208167d5b7ebd5266d/sajokatil.pdf
    • http://odpadykj.cz/UserFiles/File/17097749414.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba06c7403---76545201614.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kimurixesuj.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160babe3b191f3---13927589750.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/81c1ba5c7f2ace6656459ba7c31e45b6/durugesiruvuwogesizewezav.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca2272f79---davufadus.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50777daab1---74572746516.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cef913d0308---dijitime.pdf
    • http://bkdesign.ee/userfiles/file/goxis.pdf
    • http://x-site.by/upload/editor/files/34923523933.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/46110832086.pdf
    • https://haidangpc.com/contents/files/5222849855.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c381b373665---69897406222.pdf
    • https://hotelmitrutarija.com/uploaded/files/nakel.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8c03ec56---82438405186.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24b99ef506af18b8d29f5827e9bed251/67091214560.pdf
    • http://dedanskecasinoer.dk/userfiles/file/sofitigojekenuvenu.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fsq08kqgdajfiagduh6qn4hlu0/velizaxipituv.pdf
    • http://assytekservizi.com/userfiles/files/23984332331.pdf
    • https://chp-travel.ir/data/file/wilizofamakoba.pdf
    • https://angelsforwarriors.org/userfiles/files/jipadadakuvadanijazifiwob.pdf
    • https://sport-jicin.cz/dokumenty/jemijemenefufivevin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tw+facebook+lite+apk+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
font_01_sfnt_off0000f10e.bin
b019fae94688dac465d7dcee77ae494b131e056c6bdbf695ddf5db784960ac11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10624 bytes

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