Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f14e70cac71a05…

MALICIOUS

PDF

93.2 KB Created: 2021-09-03 06:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e750f5f783c40cca106f9c0f8b15744 SHA-1: 8b38568b3f00fe92c69a676abe85b32882178663 SHA-256: 19f14e70cac71a0573bc8ee0c1fdd1417dce9dfc7d29527a861335de44c9049f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/n60brrhbcpejt0kusgnsjifkj7/74996521742.pdf In PDF document text
    • http://hk-bbc.com/upload/file/96600935444.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/80249740673.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/98366595140.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f01ecff43801c8b908729ddb63bc0e2f/gelipurugovunifadarapu.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabed662eb---70327884749.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/51020709669.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/govokamumuwilabaz.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/jetonilozo.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/78562126204.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/55178342284.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/53639440640.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/febunezodararirug.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/72562873624.pdfIn PDF document text
    • http://vlajamo.cz/images/file/81721543579.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/82245551188.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/tisufasirobulurinusoxiwit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f023dd7bcb---50680128118.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/xujamigar.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f4b14ed292d11b9dafed0cd8c8e82a5b/wodikilasawogovufenuva.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cuisinart+slow+cooker+user+manualPDF 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_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 18820 bytes
SHA-256: 516608bf3565f181486447153a74dae945e7232c079e3424b8665d05b9d491b3
font_01_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 10700 bytes
SHA-256: 637b5994224b95500374dc66c47e742a53c3d4cffbb4b70e7e435966f67eade8
font_02_sfnt_off00014f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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