Malicious PDF — malware analysis report

Static analysis result for SHA-256 584b797ed8ef317c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 15:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3a99c2c2b5b4837da801d9a8cf896b2 SHA-1: abc611d883e927ba8c848aa1a1b2c9b8615dd726 SHA-256: 584b797ed8ef317c2a5376662c3d6e330afc6a726a044529253b8e1bc98eef3e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading additional malicious files, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161322d619ea06---rukix.pdf In PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191015391412.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///maxelakan.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fc24d93f---jijirazu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/mesabufoviloro.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/bifupijonamatub.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/55260948611.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gt4oe74he7msste4ds4op9olr4/88279228031.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/97306223658.pdfIn PDF document text
    • http://tyextractor.com/d/files/26468324972.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/70345857045.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/25942968440.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexakawam.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/sexudupuba.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/jokopegawobej.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/76961062460.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/suzes.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/50975169091.pdfIn PDF document text
    • http://afro-safari.com/upload/files/73864183571.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/merewikexusujidixin.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/79154525376.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613173b4287fb---17266089800.pdfIn PDF document text
    • https://curvy.tw/upload/files/gudebepatebu.pdfIn PDF document text
    • https://ccskin.com/geektic/files/21231374488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=show+my+wifi+password+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_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 18636 bytes
SHA-256: 4e1e2450a98b93efa5d593bc46a0a6ffd634b5870ef039952a8a258503da9b47
font_01_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 10764 bytes
SHA-256: 1834c512e2845ec526cf94277cc7d9418b88bab4f923db7a1c30ab063671f120

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