Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22c263618051a7a…

MALICIOUS

PDF

83.5 KB Created: 2021-07-03 06:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15f69b99e5eb08305fb1d579b37537c8 SHA-1: ebd679b063f2456c91577bc446a15f382a195ac7 SHA-256: d22c263618051a7a78b2b3d34030026fe90f307d4ea4397ee94f7d8f40b1507d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://acpiindia.com/userfiles/file/38127547370.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/filuja.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4de4748192---fizewox.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/36810886512.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0jpjgsb49m95s5mtt948m6qn8t/23176165003.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf62a3fe1---64553281732.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4702eda6---foribomesivefili.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/83b9a4e37f59a89757ef58aeb3dd5718/sebovezosuwa.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/d40a8mtgvmvjjv6lsi57al3fui/55794594532.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f0baaf1a---xepori.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4780067a16abe7c84e461e61feb03b2b/mexot.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tuxetarimakufetevabak.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/xatigufakerikuralojoxovo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0168531da9---43152751900.pdfIn PDF document text
    • http://artside.org/data/temp/file/94732740919.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16077e88a18692---46713569751.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/ninamolunaxi.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/26156762323.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4cef58daae2394458f1e6f7db84a7826/duwanofibazuka.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/42494425006.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9758800692---vilitaliguxiwinuwimal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+wear+capes+in+minecraft+javaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 10868 bytes
SHA-256: d24dcf01af39f0f13b48964dd7727bacbaf6a5d05a2c5085d57313efc55b4bc0
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 17108 bytes
SHA-256: 8b761e5ac0ac92e6089886123d40be7f09b471898097cbf1979c24b35220f7b3
font_03_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16

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