Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac7e688e7c3bd35…

MALICIOUS

PDF

85.1 KB Created: 2021-08-12 11:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a39e2cd549212f2f5e064b1b1404e57 SHA-1: 1074df9e5dc08be32d668fd405d7b08ca24a6e8d SHA-256: 0ac7e688e7c3bd355797127484ff5d65de31737c49d9cafb8322ae5d5b328f73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, many of which appear to be compromised WordPress sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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 http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29b140a4f---68142938903.pdf In PDF document text
    • http://aimecostruzioni.it/userfiles/files/visorurisazojamine.pdfIn PDF document text
    • http://atek-ent.com/upload/file/4668893953.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fexazupatubuzava.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/81437783710.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a0629adcb87---38118551196.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/mupatagoko.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/fhpcu719tl92uvao9c5nq2ccia/tidemut.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/munedawotaxivaj.pdfIn PDF document text
    • http://cga82.com/admin/File/robuvimul.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/72655358237.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/48413098659.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/68512780514.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/88625464033.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rixamewederomixuwolamig.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/narogawudokivurodotejel.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/jifevutalanazededi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tisumix.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8359daeb---gowalawe.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/3875815915.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vosuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=king+arthur+legend+of+the+sword+script+pdfPDF link annotation
    • 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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 17212 bytes
SHA-256: 4767be52a58c9fb4d39368b4d237e87d481d2173ee9b00e1f867ebad8a670cf2
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 11076 bytes
SHA-256: 9ec1c3467bfa94abc20b7baf68d11f22aee55b5df8dbe83764f3c5cd1d24befb

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