Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76b81267cea0254…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 14:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bbc7ce9b9cd8961b3f2939c863a2f3e9 SHA-1: 61fe5ebaef419219c9f30d600e2017a3147a3c72 SHA-256: e76b81267cea0254978935f876f0b271b140a2c8b719bb57bfedbd13798afc3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=sims+4+clare+siobhan+cc+folder+download PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a6c31bc6---73320823743.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87633201375.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a294955514a---28158578442.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/166c778d2d4d1760cfb1857537f33d4a/ranitupeb.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/68820559338.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40fcafaf9---85187917429.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ia4unakn4k9p8479eimsiknsf9/woxuzifivakij.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/91037393549.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809269a1b91---40018940110.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/40132087020.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/31898644121.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73748987325.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbf7855c5---22920810481.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/tujivudoxef.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/86737380735.pdfIn PDF document text
    • https://tepihtrava.rs//files/xugatamikiz.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/56910047077.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sukeponejumunodor.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b8aa0b10---nirimivopikulomid.pdfIn PDF document text
    • http://4bx.pl/public/file/potigurikoriwa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e993281c---58693657692.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/nd6tp2l7ga98ocfe831kk37jjd/68317026978.pdfIn PDF document text
    • https://www.youtube.com/user/claresiobhanIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 16772 bytes
SHA-256: 412b64aa4e34898692d3dee5800f9cfa88055c8e0e442590fe920196f6c315ee
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_03_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 11020 bytes
SHA-256: 999a6dc560bc024e37763af3af15cb8b7f25ff3115e4bdae38f3ab0822e5f42b

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