Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f246f6ddac9ef6…

MALICIOUS

PDF

96.8 KB Created: 2021-06-25 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a30c000687a6ec7fa7af106b18502531 SHA-1: 824746e7da48b58fc567f4c9a1de2561e10e8f64 SHA-256: f3f246f6ddac9ef61f7b831ac7d0d1afb9de3e00eea9206c47242ca11b206d9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=precipitation+meaning+in+bengali PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2881c9b1---zamamutilowojepukamejaguz.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/26607685100.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/91720824702.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279e18bdf---xuluzurek.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/relmj6apt8b5c6102aofr5lh80/tarapexadoraji.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/39447328415.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd2e69163a---fegeke.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d1c79668---14568770266.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8qfnk7r59u8dsq8ira1de1ivtg/4638521410.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6a39eefc47313c26b50df1cb58a29bae/2442694162.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb357b2337---89911445694.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/63880783408.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/12488042105.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/dasisezipugupiwiwomekasel.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/45949742615.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/74334843279.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/29580164850.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e2f24f0e---topokenujunetudibib.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0d8fe13d041f46a8d93aa208bddfa800/xinasiwulopaderelipij.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/31561e13355e58d7a8184074d1256ea7/riferuzefixepofofozu.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d505bc337---gikekumesajafes.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gifakevilen.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ef2536459b06634b2308fab8173e2bb/54420375636.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_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 19752 bytes
SHA-256: 50460aefbcfd39b236b7e085c7222493b63583cfe44e41be7321b93b8a6a28c4
font_01_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCF 10692 bytes
SHA-256: 381c942f70231924d4731765c50c80ab22f7ff4964864b1f2f8a2d3fd5e73174

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