Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6504026b3d3c8f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 23:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96b8b5372b4cedb899ecbcc30db1e451 SHA-1: 877a5cb23a125405c0e1d19414095e9555009473 SHA-256: 9d6504026b3d3c8ff3a42a0a7af9402ca68caf6b8f8a5c5912d971b6bf14f862
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised upload links points towards a campaign to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=marvel+future+fight+android+to+ios PDF link annotation
    • http://radtel-sport.pl/userfiles/file/20230991077.pdfIn PDF document text
    • http://normel.org/files/upload/file/tosagusinuganidofume.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/71621402708.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zeninowimi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/29700634370.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/pudasotasokonudonudeje.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b70e8078---ludinefejuzifinemawavop.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5f26288a---32069284375.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210908004942.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/feluvijutasotosexamosem.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/95543663702.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/zedaxinidumiwako.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/63792215478.pdfIn PDF document text
    • http://shahgrp.com/uploads/10532187853.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/74755658751.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145649ef0a03---demidexujazumojusudodi.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/24518907327.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/25304646872.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/48239354086.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/sufazepetaku.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacf0d0078---53414498535.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zarufuraginudofipar.pdfIn 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://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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10792 bytes
SHA-256: 28c049f3be4fe5c4dbfa54214d88a22291787f5c83ef327c15be3986bac81538
font_02_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 18496 bytes
SHA-256: bb2f4df24b842d796af282ee03f62edd114f29fe1457998635541d74594ff8df