Malicious PDF — malware analysis report

Static analysis result for SHA-256 61251531331070e2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 00:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be1837d6d12339b9d652599c372cefab SHA-1: 0cedab920149e7671478b0eb62769556af9d4810 SHA-256: 61251531331070e2510c366a789afbcb47ecc3024451943146c997b88f6f0f09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are associated with compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://www.39koratmachinery.com/file_upload/files/80156834330.pdf In PDF document text
    • http://energy-labels.com/userfiles/file/varatanazis.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/rasiraz.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/85279958382.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/ruzanuf.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ad06e228---torokozolusawaxudizuxopu.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/vobiwilowibowus.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/68337256661.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2995546869.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210917060859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132909c4a9e8---wolatu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/78378043088.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/dabalolid.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zefopivilonogur.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed026d3897---73019819756.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/15652904352.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/50213030898.pdfIn PDF document text
    • https://12shio4.com/contents/files/vizetoguxobiligiw.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cb86d2fd1755a18c30620549af73409b/moporadorikakaka.pdfIn PDF document text
    • https://led7.ru/file/86577238630.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/74774166252.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/riditasafugifaxolex.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/xafodoguzixaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f36e35f68---73117287382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=war+heroes+mod+apk+unlimited+moneyPDF 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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 17716 bytes
SHA-256: ab88992ffa79b5f479b1585c5f98a3494d071eca0b129c121e33fc3a9616ddb6
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 10956 bytes
SHA-256: 5e75a4d1c7708034cf9d06628c43b2d7d22217017a367e4fc491afb2caa9ceb4
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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