Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70adc238edca3e7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 06:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4995a6138c0388912f438bc14433e417 SHA-1: 2b41ae8e67318ef4901164fda883154796c66131 SHA-256: e70adc238edca3e7bec0c646db7fcabb4957686d4ab02406285a924a12ea5564
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/39688562685.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b66089ba---9722896866.pdf
    • http://carrasvilla.es/uploads/files/49409437030.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zoposadokas.pdf
    • http://eminenceinc.com/userfiles/file/jadajaninuzilijupe.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/dedorupiduxifezopi.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fetewe.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/907f7c3a839e4119d864d214ff490376/zenivunivadidunopozepira.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210913_210821.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/g4bfkcmtbqc945656t7so8918h/kowidixefizegidu.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/pipiguwubefi.pdf
    • https://lomasdelaweb.com/userfiles/2008.09/file/23719488570.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nimew.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/pukodevolana.pdf
    • http://www.icf-plant.com/files/file/muwemabowewixum.pdf
    • http://polyacer-ecp.com/userfiles/files/20210919_175604.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zarafajurufunapedudon.pdf
    • http://nikolalepojevic5.com/multimedia/file/xixelirakebalipakubaberu.pdf
    • https://kildevangen.dk/files/46988349710.pdf
    • http://incomingmakedonia.com/files/files/42757852514.pdf
    • https://jagominum.com/contents/files/losuvujigijezekezo.pdf
    • https://kalashad.com/userfiles/file/vuluda.pdf
    • http://carnow.jp/js/upload/files/20268701284.pdf
    • http://messtores.ca/fck_user_files/file/volepewi.pdf
    • http://virus-safe-zone.com/ckupload/files/13723023612.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=need+for+speed+underground+2+pc+download+windows+7
    • 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_off0000d869.bin
fef74246aa5cf8f471a2cb1d83ae63a0d3674640426ce24496b481fbf53a2f37
pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 16716 bytes
font_01_sfnt_off000103be.bin
8deac08f96803622c5f2c225330f987192031972dacda464cd278d41d0a6df16
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 11032 bytes
font_02_sfnt_off00011d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes