Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ec5c28a5f20c94…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 09:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8ef2021d5ed5872b9715777927b7fbc SHA-1: 900d36789a62e773a124b4439517b75324f7a3a8 SHA-256: 17ec5c28a5f20c94e14da5c36cc602bac6df2480088fd5c69b50e38fbcd67248
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a URL with a 'free download samsung galaxy games' UTM term indicates a phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to download further malicious PDFs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=free+download+samsung+galaxy+games PDF link annotation
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fufakavunubosesexa.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/58928879885.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/46823701856.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4358f015---nifitipir.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/leluwupoz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f9f19ee1---podagojolugukukeger.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/36005380819.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/tokexe.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/gofesesinujuduxipapam.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5a47e423a5b65f98509497dddc9a7fb0/59672671708.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/59979367127.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cv9i7on5jhebahtl804kgqqeen/filetarejivexetobop.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/jimelonuwab.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/31391084856.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390681b0291---5806259572.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pejijikekafolesajodil.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/buxivukelaxevofovowu.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/18305696925.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/nezamuxodaberejivi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308cc66a93c---26603381645.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/21637354013.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://w-mill.jp/images/file/didarimipera.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613855a31cc50---24042242826.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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10780 bytes
SHA-256: bdafff8fc2eb6b76a2b8d69e3d4fe2a5524dce8f0e1f8da87ef53bf98686c1e5
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 18192 bytes
SHA-256: 843a70b6cdc4e2bfbe2ec46329542e81f183831ad47e9c0da4c46a854263d8cd
font_02_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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