Malicious PDF — malware analysis report

Static analysis result for SHA-256 c008cbeaa1df68b5…

MALICIOUS

PDF

83.5 KB Created: 2021-08-05 04:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 684c8c1a90a7053cd2790fae14655137 SHA-1: 6fbe0fb201c7df21e01c77b856cbcd03fdd72e38 SHA-256: c008cbeaa1df68b52e2914e0f0353b3f14cf4e109b7545fa113b240ba937a28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS platforms. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://palet-school.com/files/files/mimanorevome.pdf In PDF document text
    • http://studionegro.net/userfiles/files/88657435332.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zenagibezisazazekomas.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/dinidutakewa.pdfIn PDF document text
    • https://domilot.com/uploader/files/39743933962.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekubonuz.pdfIn PDF document text
    • https://premium-house.uz/images/file/17477831074.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4a9mpjv5ucibqfg8bbfi02i0rj/73440659243.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q447897l7v5m3ckvmbd3ti75he/javegemitun.pdfIn PDF document text
    • https://razredna-nastava.net/files/fudaxirubajidikobelawulir.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/nuxezed.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/giguxodixo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/jijutikaniwo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6a1f5a4e5ac9eb90c77870fc9a8a0d0b/51549133275.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/sufulajasab.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073853d96c70---82982692775.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/36407189140.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a784ac5a9c26a5ff35bfedbb0ae78fff/2913816424.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/81152391758.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/77275539825.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/tuzupililevuwenodi.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/tamekufivifijozetajanej.pdfIn PDF document text
    • http://prestopc.it/upload/file/xoduwojimipilikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+makes+the+best+chiliPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10396 bytes
SHA-256: 9d049cd3fd0d415cd11c0f215f0cdecf9bae8265ffd2aa1d7de8ae212209e007
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17076 bytes
SHA-256: 81262a5360b934246c1d42ba6a2e7ff5e3717bd9628231ae0971f3132b3c024b
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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