Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22146f1d788019b…

MALICIOUS

PDF

83.2 KB Created: 2021-07-17 10:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 582e6fca0049ce0530bd74ebf9938205 SHA-1: 67ee40eb1c440efdad0923521c44f9f901668287 SHA-256: c22146f1d788019b59fdecb0f53afdd3fe56be6921604dd48470e4830c219c21
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6272

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asja-doll.ru/userfiles/file/2148624545.pdf
    • https://nic-irq.com/userfiles/files/vajur.pdf
    • http://nhasachconggiao.com/luutru/files/32044426427.pdf
    • http://magooferta.pl/uploads/fck/file/47538594749.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/49076671422.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809758e6918---53651490020.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/63730dasl2jbbfoainr2qqilgs/wileki.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d26152d0---bafolajet.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c2d9d05dd59d647c240c60ec1bdc153e/78280387480.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v57jjs7qpl4kfj1oksc59qn3d8/13553485744.pdf
    • http://luingpyrex.cz/foto/Image/file/4122364786.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4882bde2d---29514824116.pdf
    • http://bigxra.com/uploadfile/file/2021060418034773499.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/87187511071.pdf
    • http://andlupa.com/userfiles/file/bonomikomuposod.pdf
    • http://chnli.tw/CKEdit/upload/files/jozepox.pdf
    • http://birzebbugastpetersfc.com/files/file/komisunamekapakorogilixo.pdf
    • http://moscowprice.com/content/xuploadimages/file/vapekapekolopidowab.pdf
    • http://agataklimowska.pl/userfiles/file/67053685803.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941501969ca---kopuzowusepibano.pdf
    • https://harkakotony.hu/UserFiles/file/kelupodanasevi.pdf
    • http://envigest.cz/upload/file/57307466318.pdf
    • http://tecsun-moscow.ru/docs/file/xitekiguriwuxomaxit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cry+smiley+face
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 16792 bytes
font_01_sfnt_off0000f960.bin
6a2a0453c9e7fac2191c82a1a2965c3394e6f9dfc421dd72a0be1c717a7c8b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 18096 bytes
font_02_sfnt_off000128b7.bin
1b4af0300414c6b2e0ef1a855a419b06ac6cf2d623158e143e895e73070c648c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 17368 bytes

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