Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec71089ff9b267e…

MALICIOUS

PDF

97.1 KB Created: 2021-09-04 19:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdb7f2e0f81f4c6f259cedb162259212 SHA-1: 25e9644ffe9b27e6927b88db2fccd43eb791630a SHA-256: 4ec71089ff9b267e7561ad8b02b0d4f82308c33f0e8382eb0defacda9a496628
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. ClamAV and ML classifiers confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://betalinktech.com/blmedia/file/sadegivuvakukopunukaluban.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/cfc206194bdc7cc0cbc90359b5545550/81634124741.pdfIn PDF document text
    • https://projetovm.com/uploads/files/jidebikigoxibiwu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608112381deaf---tuziputiviwekupi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9e5fd39cd2689ecb7a448bf58cdc564c/jegikir.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/12033293107.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/30627743169.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ace1b4c4e1---wibuganivodide.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb44bbcbb4de3c66e495418e8b81f496/47334192811.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/47455413989.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fejosadigurob.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf608d2f9c0---livulumazovabokipa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa29b0d366b---likopupimatobo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082d303e7f89---dolorazikikaj.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d7fece54---56871780484.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c34b0c096---kazoxonosip.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dumefobopov.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wizesaregebibukuwomejojo.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/zudepomibadurofiga.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/zediradusiguto.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/retos.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d224ae3ccf---62835849142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tactics+for+listening+expanding+tapescript+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 10860 bytes
SHA-256: 44783f2d603e6433939ef6275f5bdfca44199b37a4a560107ba72d1e5e755259
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16728 bytes
SHA-256: c6fefa8548519cbd229d9ab205afff36696c5d5d7012eee5133f2103f778c9c7
font_02_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 27240 bytes
SHA-256: bd09685c21d4fa7232ba6cf6411e92f2f02eb3415a05e99ade5d384487b73e0c
font_04_sfnt_off00016d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0E 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729

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