Malicious PDF — malware analysis report

Static analysis result for SHA-256 0accc9d041435d0b…

MALICIOUS

PDF

91.8 KB Created: 2021-07-19 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80abba5dffbe980bd481c169553a2011 SHA-1: c264e098dd9eda2f3735f4fcb4083df2f86731bb SHA-256: 0accc9d041435d0bf821bf88b013d4e091a1376c72d2e3705fc3b76303fbd9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which point to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a lure to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://evolutionchonburi.com/userfiles/files/zarike.pdf In PDF document text
    • http://falerisztika.hu/tmp/58717196894.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210708_161723.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/penadewa.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/zixusozanuremon.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807fc02e5b---39304610581.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/wixatamatazadida.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/mijakovobetew.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/93777536387.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1f2bd65e---liviboranazaluma.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8292276adb---nekuxosepebologuxigire.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/12004503317.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/92019736725.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dcc075f4---19266222760.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/batazuxatulupavogiluteb.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/31957155215.pdfIn PDF document text
    • http://dgjst.com/upfile/file/3994551445.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kevinuvejeli.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rfmvr0chjbs7bit53iia6sil56/dafuvizuv.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rfjec0gpaa3pg28qo72qti9ck5/63408776622.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kagizegixumesesurulurir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29e644cb9---40228858748.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/33184312321.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079258cdc370---96841260202.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/sudumipasujizil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scalar+matrix+definition+with+examplePDF 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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 18204 bytes
SHA-256: 04037d112e5ff72afba161ea19f5a5643c41e259137ab52a7f32319e2776228a
font_01_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 10980 bytes
SHA-256: 06c4f611df6a13e3ff8037fe442d273d7346f1b226768e0b57b7889b7804e9a9
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16332 bytes
SHA-256: eadea21f427d7b12c95091ad2cda65a53d84f5401a6a1432f063d1fe05237453
font_03_sfnt_off00014923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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