Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c0107b6a0562e9…

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20c07bd8388f851d41e26e27269b0e04 SHA-1: 8235d92a4099cf7863e00bdbec2712085bd92107 SHA-256: 63c0107b6a0562e92461c82650296f9f17072f52b6480875860ee0357d7c6c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the distribution of links to further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090db9a38220---tizoxuwefagati.pdf
    • https://unique-u.biz/images/uploads/file/nozatafobuvanapokiviviki.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9107d651caf4e2be73c52f0d0fd3806f/gadulazerusubumolexow.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab579c4ef09---25834020375.pdf
    • http://shosholoza.de/file/sujinazokexisobumez.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bvjfso8kf18vqo2564bgmnaee7/zuluxusu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ab48e41b---xevekadivilokofoninejomu.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/97496670999.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245abb1d14---6204221604.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076dac053fbe---rajuxefujafisak.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07e62055b---jiterolekeke.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/03be9ed9c84e7976b2f89c0fb7e81cd0/35291205712.pdf
    • http://studiotecnicobonoli.com/userfiles/files/jilotuxewisugaloxonuw.pdf
    • https://toocapen.com/files/xaxinuw.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad6f693ec---tiwexazokawirorixafabu.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6d5bcec07aa2b2224cbc278ea89ec85f/dejeleka.pdf
    • http://www.urbanwaterways.info/files/gexed.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b998b99203e---jelebamajiburawogi.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ede39ec3c---10607864020.pdf
    • https://noblacklist.pro/web/img/podborky/files/14831358418.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3f3a1cb130e596a1691a84b9ad669279/dopijevugigowa.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/20120586903.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/84af1f7bb9e02e88c667dff28bf12961/donelumaje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=easy+things+to+do+with+watercolor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e863.bin
16c290b76d329cd7ff9e0b23a3478e2320593d2170083b8d4cc4bbb42715e027		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16436 bytes
font_01_sfnt_off000112f0.bin
cdde2781fe754a5ddded2e1c556a414bd4b8eceac23aef3f93b5f93421c0dd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 10832 bytes
font_02_sfnt_off00012bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes

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