Malicious PDF — malware analysis report

Static analysis result for SHA-256 b688cd31f947e906…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 02:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6862947d914fa4e5cff236fae6ebaa08 SHA-1: 6af6074aaf72bbf2f086cc5f037d123afda057d5 SHA-256: b688cd31f947e906901734a9ea544247e27db6fd4f13dd0a18e832476c58431a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. Heuristics indicate these links are hosted on disposable or compromised hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=remove+watermark+pdf+editor PDF link annotation
    • http://kliknetezde.cz/admin/obrazky/file/kolomekeverupujojopoxaka.pdfIn PDF document text
    • http://cycling-software.com/files/file/74358007175.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/90234747119.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/75eodqbhbgc82koqpue50geaqq/jesogemezeteni.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/21302236771.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/46856675548.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/37054775971.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/viwowa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe915e0b7---88501306.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c890e72213---54338745390.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/51395055613.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/30690498591.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/31672004770.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/nodofowamaw.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/ranogunekiruwuxofifiti.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b917e345181---66056194223.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xifujumagenedobomex.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/89922106526.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/muxok.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/jegobexojumenalawozolug.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kosisevoxegefusudune.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/ladeg.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vejamugujepojonajadib.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8aabcdbd936d6b47d7b72550b8771802/wikemenoxizuzogigemo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10632 bytes
SHA-256: dc61a00483a5bfdfe414d7e54a1fa8a056a72ff12a0298dfeb27dd3b6e3e1992
font_01_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 18072 bytes
SHA-256: bc938a7fa9a079374c4a23e550e77286e29fb1f16e680a5cc2c37e5015c568e5
font_02_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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