Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48d40c583e1c733…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05ed678d2f30f0199b3b3831a0a4bd5c SHA-1: 6ddb2e1ebcce19aa3fc70c1cab6bf16250398503 SHA-256: d48d40c583e1c733748495a386358bd402e04813f9aa2e0eb76d5d745378c5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c345f1fba---15773664593.pdf In PDF document text
    • http://medob.org/SITE/files/editor/file/67652947700.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/84364885977.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/74157540403.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133beb813fc7---xegamexikaru.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/dogalokamidogudovika.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/18250265909.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popijolomak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59c195d16---37306727590.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/lopipuluwi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6a4cd70613201f05ff911edb3f57df13/ridowopakuwuguwaluzin.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912011333.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/59466713845.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/53499499322.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/5641949664.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/vuvatekewodopek.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906124809.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/6521420255.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1cr5hck1ger4kffbfu09ljji0n/vigupexomekitikifowejitu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131039fa7fef---govivaborizegovudon.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wazevajokolonusobex.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109030145579495.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/zikexejizemij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=justice+league+2+fullPDF 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_off0000bbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 17420 bytes
SHA-256: 370c344fc8f6b6cb371c0d0602815b41de3311fa0113d3ad8636a706d3d4785f
font_02_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 10400 bytes
SHA-256: cbc0fae19581387a66a2760adfb587dfdaec98fbcabd0653893ab4258c04945d

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