Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71a54d3caeef1a2…

MALICIOUS

PDF

87.3 KB Created: 2021-06-10 03:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c6b5407cb8341352f43e5d89f2a1c5bf SHA-1: 170e4ad113c692d775e91ca38241be7b75a420f9 SHA-256: d71a54d3caeef1a2410b550b6ddd1178b561bee83a1360165224dd382e7dec47
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by a high number of external links pointing to compromised WordPress sites and disposable hosting. The document body, though heavily obfuscated, contains references to 'getinsta unlimited coins download', suggesting a deceptive pretext. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=getinsta+unlimited+coins+download PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3092ee865---tenur.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b808bc0165---jabitoju.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d965522bf---2344114916.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/15e711ac8f8300552ca174aa15ea7adc/faxulujuvapitumali.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec1183d54---63546337720.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/tokulasodujesaniz.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0199376b1d8c0585dd41f44dcf293db8/52975321372.pdfIn PDF document text
    • http://islandpointfl.com/userimages/11391715493.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0dbff0b89e06f7c13d352ce28095df64/jigopufitadapokoniwib.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a6a80355---ramuxefoxerivajax.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wuvapazezumivola.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84208f5c0---wagagimekiwosudediv.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t4aq01jr6k4ea4gq1qughbcrdd/figenisupujanumisu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1ne6ag7esd437ii5kiuh567643/25371382198.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/796fdc22645e66b656acb8cab09cb6a3/33708682497.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/52218298071.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_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 5112 bytes
SHA-256: 1ee8d40d957940263e663933d3f073cd312775dc76a4676cc8cd4b64b1ef79c4
font_01_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 13088 bytes
SHA-256: bce4bfe18b5fb4c2d4e2249048cd6879be063b80e726c87786934e1e13bc9c8f

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