Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc3a6066c6b59f4…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 17:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 260cd1621ffab967ef92f3174a5870d2 SHA-1: 2ed12ab35894bb34ef15fcd7499b0b0467f56449 SHA-256: 8cc3a6066c6b59f40cf2793b8c745876b588bfbf45f1f7511219cf2ca2f8e129
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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
  • 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 https://synerhu.ru/uplcv?utm_term=confucianism+meaning+of+life
    • http://bukharasuwanee.com/sites/default/files/file/nogufogejek.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4febcc107---gibuxezotupugotav.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/3t198pbaklhrr3l8p80uu2pjjm/31231595667.pdf
    • https://heatingboiler.ca/fck_upload/file/duxirozupavobuwadeteg.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a797a7fcb4e453264823206de033b18/38220836601.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/09da17164adcf64939b4feb14e69fb6c/27986688527.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/papelizupeza.pdf
    • http://midel.me/userfiles/file/4099832456.pdf
    • http://bearings-home.com/userfiles/file/bitel.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5101cb023---37005577808.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8842rit1nn81f5bebii220334c/jibovulagowefasaror.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2o54i040m36pb3eb49800ti254/45755904411.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073c43f8732a---jelutavovaraxezilokud.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/151287619972b2a83bae4e51a97cd634/kenerak.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5060fe54a188f26ffabf6b71ccf5c943/99302812026.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/95514575272.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a19c2b80176da6ada23b7b9565888ff9/ludokoxukazaliwegim.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0tstmogco79qu9f5dntcdn792q/62454746451.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160942541a075c---wufuweduwovakejodeb.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abcd64a47---giluwovefaxabirana.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606de90596121---nulovatunabagijopur.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5033b4068---11778309048.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/382691753966c59739b6c244bb221a12/zutegovupotufoxatipifi.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a14fe15f7ecfc1e146547654acb11311/5382953752.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/5489911113.pdf
    • 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_off0000fbd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
font_01_sfnt_off000113ed.bin
350492f9bfb87d3877aae090a4fecbb0611f4ceca096b7b0ae985acb78896e17
pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10612 bytes
font_02_sfnt_off00012c30.bin
5ea4f10e49db5d636ad0cfd885d85cc2471c8c9af028ccc48b3258bca6f71935
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 16996 bytes