Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ac9c22c7f92e38…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 23:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd59b881f738afc99fa82d8780c82b9e SHA-1: 38d77a1592f5b322d5e6f76027129773f6089924 SHA-256: c0ac9c22c7f92e3880aeeda64158e6458b66c28f12493546d5bd2e29f68bcd2b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links are likely designed to lure victims into clicking on them, potentially leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a50408fd---18789790776.pdf In PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/48567820591.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1rttk197201n0fo72c5orvih89/16999401259.pdfIn PDF document text
    • http://kelvista.lt/images/files/bunemubupedojinizabubip.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xemaj.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/tixukexofisaviliza.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/lolibojoxajuguvo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/muvodowotoxa.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0149aae21a---65433277440.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e90a744ba---79796537863.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/gobokupa.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/77529356644.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/79012086758.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073f07f0b3b7---85914961792.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210830100439.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7aguarp0kcnh88iv44vcjhtuhu/silugavofod.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c3f4dd3b428daf6b8b6f0eebeadd923c/20293118925.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/85247988074.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d78c457d4106d7420c75f3ccd6be0183/15845201029.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c083077c5ce---39209617316.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/pelaxexifixujuduxila.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090622a9a8d4---68944643883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cloud+vs+on+premise+comparison+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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10880 bytes
SHA-256: f4f5644ddbdac7e7a5e353c1b1c684b0787e9eb78bea3e39d6debe268e4f50e4
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 17016 bytes
SHA-256: ee6f0fff285e80fcec37e211693c85e6f6b4c3c69c9422a43060b1f458ba5af7
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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