Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bf5347f47826d7…

MALICIOUS

PDF

108.1 KB Created: 2021-08-29 12:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18c7ff18e13c0072a1df38343ad3efe5 SHA-1: 6a3fddc9b6fa5d7e4db3c0928b6c82bc5ec11c03 SHA-256: 24bf5347f47826d76437ee96a715821d814e6c3b37f24ed41dc73223e1077db0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3906

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://krisoc.ru/uplcv?utm_term=overspeed+service+oy
    • https://privatecambodiatour.com/userfiles/file/rerub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a590a22b5fe---64494974824.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/82101603836.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a118ca36fd---xopotapinuzotiripeno.pdf
    • http://beijinghuojia.cn/userfiles/file/lejaxigijenetidolenulutes.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/sivaruwafej.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s2qi9cnk1vskvhfsn5tbh64tde/25585020060.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/47113676798.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd010bdee0---88970277150.pdf
    • https://europartner2.pl/uploads/21490429000.pdf
    • https://atlastoursntravels.com/userfiles/file/wevegetopagiwavulujisapa.pdf
    • https://avenue102.com/uploads/file/turisat.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/zoranuwojibawisasuv.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c111eecdef63a38d600d07d436af564d/jivujadazawokiteb.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac16ed105---jijabuw.pdf
    • http://inmaabiladi.com/userfiles/files/fugokixubukifepuvubep.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6d0k5voav0b0n3i2pdjkf1nmdb/57742080427.pdf
    • http://apsencollege.org/test/fckeditor/file/vokajogo.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6bfd92e1b320013c09ed9cc8f1179277/xugituvatunixogu.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/713b12aee87606a2c799922623e0f9a4/daziwubesimavifiberibepul.pdf
    • https://guruamardaspublicschool.com/userfiles/files/gawasuxuzu.pdf
    • http://93564497.com/userfiles/40250065736.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7cde24efce4990646b2a552c47eb9eca/wiwawamebo.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/53086750714.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabbe29a92---dobudasiguza.pdf
    • 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_off000160a3.bin
385f7622522b0b543e66fa8cda761253db9291bf76b963d343f4618034fca77a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160A3 19068 bytes
font_01_sfnt_off000191f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191F9 16792 bytes

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