Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef03228ce90b5ee9…

MALICIOUS

PDF

92.8 KB Created: 2021-08-07 15:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb538a592c17a0f4a3171befd462b400 SHA-1: dd07c2bdcea30022a3feb69e6b5a033735cdb472 SHA-256: ef03228ce90b5ee9dbf9e57ec44b4daf57ac244fac8e0f3dbc7f4e70a03ea3a5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=how+to+connect+android+phone+to+ps3+controller
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3b7076c0---gebejomugasojesoranuporo.pdf
    • https://ottopianos.nl/files/resedonetuwinezad.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ca8e6f5808f7850c5a3db817e1ab5c54/pakaxubi.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56da1cba99---sajigirakinewepulasul.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a2b3c63e---zexubulelapepiwe.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v8144354blsi6p7dflr038svtq/24572206019.pdf
    • http://amadpich.com/userfiles/file/5939798612.pdf
    • http://midel.me/userfiles/file/62917109129.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99a50056f---86167907424.pdf
    • http://onnetsolution.in/userfiles/file/85874709926.pdf
    • http://air-con.ru/upload/files/62929314774.pdf
    • https://basealimentare.it/webroot/files/fck_uploads/File/34569479852.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e64d98ab---13276395536.pdf
    • http://a-kamen.com/userfiles/file/48454920262.pdf
    • https://secolink.sk/userfiles/file/47084165957.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2re0gg9sunt5cdkn047bar1b5/wedogenudusafog.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gifodigikorepakoden.pdf
    • https://steammining.com/userfiles/file/wozerazefurabaxugoxi.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oqm9qk336kaj6bkdf3erleokkk/92815934848.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/85855201218.pdf
    • http://wildpflanzen-planung.de/file/670864867.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098628b5b9c1---sazepezusitel.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/lumagagotajowubum.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_off00010482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
font_01_sfnt_off00011c94.bin
a699f5153254e9cf7c15a9cdfc2630fa9b59c75b647c79c7e8acaf235f4a645f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 18128 bytes
font_02_sfnt_off00014c5a.bin
61902af94f58241ac50dec1977f97c02e59797d9a703671a7622f7dbf2cae6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5A 10860 bytes

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