Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d25ab3b001802a2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13870d3f25b3196a1b55fac399ea75f8 SHA-1: eb7ed419a4426952acd35f66ee5b57e43228ec46 SHA-256: 2d25ab3b001802a20c041f9a886ec384389bf2d0c38e50049664e7f9a2370e3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and a link farm indicates a clear intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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=negative+numbers+test+pdf PDF link annotation
    • https://www.weboonline.com/ckfinder/userfiles/files/85812190446.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e8gpqtlgtijk2b1528hu4ftjo7/bonazatavogagupipim.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/melezeneparedorebop.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/xefireba.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74d80c16e---gokexeperujafef.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wemowevefej.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b1b35e36---nenevofoxozorozanenetu.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/suzigukuxupupumefagulak.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/ramaxamufetuwugozoro.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/guwadonufesigunidido.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d2b26d20eadcc07732287ae9947df825/tupal.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863070f38d---17191669475.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jimitupikuvipomorupevipu.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/xivetoledaletopojojodexan.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rojirikewokivipo.pdfIn PDF document text
    • https://codecs.ro/images/file/96286926953.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313f671ee8b---lokowizuxaz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8578c0c63c---kamaguwe.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cfe146e5---39824341027.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/vitorunomij.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9c77edf4---jeverejasidafuwam.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jeturuxizikulib.pdfIn PDF document text
    • http://megalaserasia.com/upload///91133167216.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/60946485864.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/24907256561.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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 17640 bytes
SHA-256: fc72be080319a3e1888a8520f7463fbda505ccf9646fd1b329c37be8e1f94e36
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10960 bytes
SHA-256: 69e670d1976cbdeb143ec1a1ac5aa5bfe1b43067d9de54401ee6c5a3ea8b3801
font_02_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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