Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d86c53ce2ff91d…

MALICIOUS

PDF

68.2 KB Created: 2021-06-08 08:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 47c7029b642a0621159f7877aa4edeb9 SHA-1: 4f0726abddd36d140722166f325ab0c9b4fcd62a SHA-256: 05d86c53ce2ff91de791441e773a9168f07f4e18d75557b1ee0082070d446492
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs and heuristic firings indicating it is a link farm and a lure for password reset information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the overall structure and URL patterns are consistent with credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=how+to+reset+voicemail+password+on+landline PDF link annotation
    • http://cbestdesign.com/ckfinder/images_store/files/33800784810.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/79414589321.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/934ab5023c8199720b1de8c0b7cf2240/tunujasunolokejina.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/fumukim.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f6068707f0085e3d00d9ad467ca3608d/65074887479.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099f90f3bb21---sorofodudisarezusilolir.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/d7merge6csls4k6q11p1impv73/vobetozifopod.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9gl61eh5497gn2pi0c732b2bms/wikebibo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/fekuxusedagebusuwino.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/28822996726.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97beeb6ad7450d12c56f44e0530d00a2/51300554937.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/menawupiboripizavijibiked.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fibobeposekabanutubagix.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/eed636d813152a03d7d1fde6f8019959/polobogifopusugujonokamob.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b00qj6sbakrtrs1nv4ba322hb4/64885046685.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/21100062784.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/jajugixotasenatalureworij.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ec0de1a0fc1879538a2c35792c4cbbd/45330931834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 5332 bytes
SHA-256: cbdde447fc90dc4c3a80e0bc1cdcc0a5471e35efb69ce5b0c59d31cc21bac48a
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 10084 bytes
SHA-256: c7c674f8a384027dd383a496bc463b80ba9fc7383f8f03c8dcc005034e8d5ac8