Malicious PDF — malware analysis report

Static analysis result for SHA-256 b237267bcb3e08f1…

MALICIOUS

PDF

83.8 KB Created: 2021-08-24 23:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e75c509c2f61f6af39a47c4b75bd1994 SHA-1: e88bb7c5facc259980fd34893890c7f3ba896011 SHA-256: b237267bcb3e08f1c191d3273a7882320d03d1808b8eca180c5b0b928adf905a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://pusancard.com/userData/board/file/51234232033.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3b8dd4da---tuxiguwubukazuruwoxixufir.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/91996244263.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepatobexilojotejakiwiv.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/57125535651.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e27336cbc---nuwotowoduvesuti.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/serijegirosodokijij.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609240e5eea22---femejizijatirebigikixigib.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/nilipaxowagagus.pdfIn PDF document text
    • https://dietacud.eu/upload/file/raxojinikolifenatitexezo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a413c22e2ba---8303075734.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/84645200048.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c3b4ef9e63d6ee5e6526a619711a267b/94679347763.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f4e6f17---rilupileroremu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64641464579.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7jvgunda77pu7qjaqqujf3dnd6/75296171479.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jibozofaf.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4ii6iv95tbtta9pgi42ivhqo00/91197565123.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6sul4b2nhkr80jtla78o0tl8j5/11672984226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sight+words+for+ukgPDF 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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 18664 bytes
SHA-256: a6a056d1945dafb4c043b4898d5d519732c184140fd0455ad114a4eb1c1af61e
font_01_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 10540 bytes
SHA-256: 23198c40c42facca97e22d5864dd8756f8ed606c822f417be6e1b53c327277e9
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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