Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b595dbbc2abe225…

MALICIOUS

PDF

115.0 KB Created: 2021-06-28 04:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e39b1b6d8f6408104526bad220f1632 SHA-1: 503336bf49a0e4a269b707b17251c453e2def4ac SHA-256: 6b595dbbc2abe22594e30f8eb6edc3dca6f2790550c31106fa773a8aa324e4f8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload directories and disposable hosting sites. The document body is unreadable, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://strategieb2b.com/userfiles/file/letokin.pdf In PDF document text
    • http://bidmitt.com/img/files/file/71669301417.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b7e96fae412627842088f0f78e7848a9/baniz.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wizosejevigisowigoturaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096847c5da63---bujodomivotelewusar.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/fofopuw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sbo9citc2j47a86c15o22la7d9/kosukiwamaluf.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/30833326906.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/54198548565.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tigisudoduxuxo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/42183120329.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b31855235e9---zamelumomesudawaf.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f120ed3cf---70116928030.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5a530baa4d7cdc6f58d1815755dafc6a/9426455692.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/30/file/20210530_123252_197.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0qcq7h0qsv8vhi36nusksbs0r2/bazevubutek.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbad7229f---tadevivetabutaz.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4c1693171f807db57990cc76d35188a2/88233959438.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5425c690aa---mebadagemudomoworapotodit.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e5a94e482a1cc8111939618cc7cbb65e/vivufulikusexo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/996bkn2cpcl5o9qlc0c23m5u72/genevumazil.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/678cd5a01fae477b955db71a9e0406e0/dolilokuxit.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789cbbb0c74---dufitijusavojolibuba.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a6a33980---nirifokupukutijaxosiradog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=common+idioms+with+meaningPDF 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_off00016149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16149 17496 bytes
SHA-256: c09ed7046fe0e3fbc654d74c04d4cb7042de88b07f1c2ababfccc4c58b8a5258
font_01_sfnt_off00018ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BA 10664 bytes
SHA-256: 80f1e87904684ec12ca28a59a8ea6bf0a6959fa6bc11d05f5c8d8b024f4649df

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