Malicious PDF — malware analysis report

Static analysis result for SHA-256 587cc3c290134948…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 07:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28af0f9bd91222182ed3efcdb6578526 SHA-1: d47985dfd8896fcff5be5e51c2b8dd58128b8a6b SHA-256: 587cc3c2901349488e252b2e91f2c44a9a309705010402c9891674a1ba722f42
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 executing malicious code. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb18b28d80---tupokebubikuvodudo.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/13985752667.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14473374085.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/41239270926.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210908_C6A2F435F2A58954.pdfIn PDF document text
    • http://innotack.com/userfiles/file/91748710612.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210909082225_922304.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/62487672378.pdfIn PDF document text
    • https://slide-bearing.com/d/files/wadopelezixu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/puniwanikeniwomu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/945c9832bbc0a53286f563c5b238736a/tevotirasuwogezejetisuxo.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/81907471161.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b021d3a3---18567569445.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/tufirolovulube.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a38ca7da---tefap.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/36844630245.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b8e870952348d006f4b7161176cfc05b/wibixejalexozuxawige.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/65374722614.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353ef26c073---88910767026.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/41779975642.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77456614450.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210901_ddfc0.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+clear+contacts+on+androidPDF 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_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 18636 bytes
SHA-256: 4c4f96e288398544b4cc6e84c4f99dac0c07ac4061ec4b1a395a49ef261d3b14
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10440 bytes
SHA-256: 6dd289252d12cc383e231b5f2de19f44bc19842d94db295391a87680d2ad6311

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