Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d587dc1e56be3e0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 07:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 467496abdd073fa265b3eb83d23528e8 SHA-1: 9a2b2663ba1cd155b83df030b2017c79f7065d18 SHA-256: 6d587dc1e56be3e0336db4a588171061a8810eea30a9f72c10b384f9eab9fc0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://a-1commercialkitchenservices.com/ckfinder/userfiles/files/purikanudukobipumifebus.pdf In PDF document text
    • http://consorzio-csa.it/userfiles/files/vuxezijitenajokofil.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/40216719717.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lubiveximunaxerojoj.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/7846974413.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b717323a2cd4774925618d76480d8340/49521516718.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9f291a0d41475622924c50f4ffaaa5f0/rogoxejemowureruvakof.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57313606255.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/150a82a60be5f9af084b59d48706f401/85588055257.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/82935449224.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/471f12b02f2c36f5e65916ecb80996b0/37654454618.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/sadikifinuz.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/19460902026.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cba390ddc.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/jewigisolu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/911473eeb1950171bc04d0a88821cef0/nuvalaf.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/19769195292.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/metufazowanunabori.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718fa325496---sevabitat.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mdd1gurfd7tpgnqqss4t14kivm/35729808309.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/favosidikerawudipila.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vewovewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=back+pain+and+gasPDF 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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 15892 bytes
SHA-256: 4e887aecd147815d536846fbabedc46cdbfbde2df51d07a5cae1817985812e85
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 10340 bytes
SHA-256: daade1097c33718e757edce4d513b9aad85cec32c6a8eacabf1bad0b6dc9516d
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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