Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebffccb9c171d7e…

MALICIOUS

PDF

71.5 KB Created: 2021-10-05 06:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aa957f499bcf83c97b5a39595196af43 SHA-1: 4841b32f93fc03045f06d95bf64b4c7766bc26a2 SHA-256: 6ebffccb9c171d7e0763f54d5e1c1825d04834888ea825863bfe9d6c1133aa2b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kpghomerepairs.com/uploads/image/files/befujab.pdf In PDF document text
    • http://xlpe.net/Images_upload/files/35518006217.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/juwuzegow.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/rofetuxujalanemop.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/sopufojuxavegafudedid.pdfIn PDF document text
    • https://ibextrail.com/editor-images/fofibaxitofenate.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613958ca6aa61---19823853777.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/82466754464.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2be7c246738beb8d37dccb40eae2da57/55968607180.pdfIn PDF document text
    • http://melabo.com/upload/files/mamefutog.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8oq5n0j5iu2tgpt6n2u6o652va/vebigozobotikumatejaxafo.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/28959207598.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613e7c0b841a2.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/tolaxaganubutudenagoluv.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vijikemirarufitufeweted.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/11863721036.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/32146661675.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/44322553425.pdfIn PDF document text
    • http://eichler-kammerer.de/54162202817.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/ditozezagixisekavodutuv.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/bosukiguxopi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wepipujotovumesevawoxuva.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614542176793c---39595157383.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/73338486144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cmv+infected+cellsPDF 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_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 16464 bytes
SHA-256: 8ee8dbc0b048924e412e25b510dfd45d9f902229b2f8f7059b01c30a646a036f
font_01_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 10352 bytes
SHA-256: 8edf97bc3b6563a5365794d81b6cb19730370926e5142404cf8abc51dd1e8233
font_02_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1