Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c67f93ce0a5ee21…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 10:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66346684559cfb3d9e7b31687a667c11 SHA-1: 7a177e6e6d3d77a253fe9807e11dd8a3ee3f06df SHA-256: 8c67f93ce0a5ee218d19647be1cfa5b76bf2b8b6f32597816c7c2f48c1f7f43f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The primary attack pattern appears to be directing users to malicious or phishing websites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://huntic.ru/uplcv?utm_term=wings+of+fire+book+4+pdf+free PDF link annotation
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/70114322724.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077656b2360d---zomebofubejim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/towujosofakurajigik.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xulibamimosobigonefuz.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/pevatugonoworowodopavudo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/07c2aa9ee043e7a3458401451e2d2faf/lulerujedibud.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/662852016.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/96815081650.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/lononopovew.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/jenizasikopoxalo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60e62e836---95398686079.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/guzivoxutese.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9deea8a5892d19f7de9c5c770a9965e1/16181993470.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160993410899fb---62796249139.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/laribakelujexadafiful.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cce97daf549---54942828456.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lopojapi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bf1e910da21d2c882a8d6681974f8bd3/vutesopuzegedawu.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/gawonedajaxiserivukulomo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/8843701990.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9143ec499---venezemizudimadop.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160715cf6b5f55---44245607960.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1830225af2---22149693953.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/vitawufuf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a598900f250---vodinifus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 17460 bytes
SHA-256: 37d5540d69c3e5dad394804ffff3fbdb77a68fe48226f8506c990e3d0af72cea
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 10672 bytes
SHA-256: 26e31874f563b9d6a43b0ff416d0e975f62edb24c332707a73e473bcc7e7a8f6

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