Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f868f4166a8500a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 12:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c43bc61db05ebdc2f179a038a4676d2 SHA-1: c176de432bd167020d1b2bd39ad506cf918c3382 SHA-256: 9f868f4166a8500a3f33ef239fb83107c930d24f5cf246ed9c5408437796928b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress upload directories and displays a fake CAPTCHA prompt to deceive users. The embedded URLs suggest an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d86b5daf3b7d24c407c09b19ed75a011/vazanuxujivazax.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a914435de---85142604779.pdf
    • http://paradisoseminatrici.it/userfiles/files/38636515223.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/xowapavemavubawutafof.pdf
    • http://besttailor.info/ckfinder/userfiles/files/98181772967.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437a5ede23---23465357637.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524e71c92e---54995298111.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa988b81ea8---vivizajuwudozebarerep.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087c21c0fa1a---zepiruli.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc2d7e66f1f19743865970dd4787b149/dulumerupejilegopiw.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe29741441---sepof.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609044f792f68---valobonuzifa.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27012c11d---lewezupafodisadu.pdf
    • http://esejsc.com/upload/files/67540867412.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5de3361f---55286502527.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899883359e---38432714351.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/srv6u0sviv5i93toi1cmtb554a/tividujetuzirenotereviku.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92080842b---67738805778.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7776c0b---xejeli.pdf
    • http://chatfieldfarms101.com/userimages/vupafexidarika.pdf
    • http://odpadykj.cz/UserFiles/File/tazelivodonabelopovora.pdf
    • http://chronocertif.com/userfiles/file/lakasogowonifopenu.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062621445380554.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/bb3336a9fe749ea199d624c1980792c1/92536317139.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=i+am+not+a+robot+full+episode+eng+sub+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55c.bin
92041ce0e2a09f9d2710f2d3db6649715d551c867ca6de233766093cb283d229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 1864 bytes
font_01_sfnt_off0000ee0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
font_02_sfnt_off00010623.bin
e7642acc307cb4348052785404922da4ad4700dfe405e695b4a4a13cc5770774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 11120 bytes
font_03_sfnt_off00011fa5.bin
d49180541acf8dd0042bf3c65700d1cc9d75e4cdcfe38c991806062344a21c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 17348 bytes

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