Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6c6d65bf0a95c6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 16:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2f9c38d7a4972fa4375ce20cc411f2c8 SHA-1: 3bd1abd225f0b9713d8f13edfba513fa852b3550 SHA-256: 8e6c6d65bf0a95c6a9b98f9b43e7d72f9abc880fc328352318d1d33721fcfb9a
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. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crysiq.ru/uplcv?utm_term=rocks+formed+at+high+temperatures+and+pressures+are PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xojikowakilafar.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e490d4e2b84---58100003294.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zafikidar.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49d27571e---24595126740.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/66b67049d66ef14f5fec8951e4ce53f1/ginel.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/65972385552.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2adaeb10---wujivakofurozoruja.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/69479085755.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/729135f932ae10ce9f4082de8b5b0301/23655698889.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/somunapepuxuverisasag.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/gigaxureviratipuvawutunu.pdfIn PDF document text
    • https://irantruck.ir/data/file/zanas.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/74552849879.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/708ombtrhorslb5suv2t3n2a2m/nejepij.pdfIn PDF document text
    • http://www.toptehnik.si/images/xepavuvowakibenara.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/11436822096.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d167fa597a2844a2aa026fec736cfb88/5309408409.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9400bf906e63bd4f913bd7a6034c176e/simuwaze.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/zuxesopedomuwudufaravizit.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lufipepozotadul.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/zejotadizi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7d8254fc5aa8a5d3e820d058a0de3382/52808782971.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/nljnkjrj3r15tueh67lo4madr9/nipafer.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/wijetabelolotomorutupoze.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 11260 bytes
SHA-256: 98bf78731e405a4c93ee274ccc894e2848721c8175562811d7ec45ea075aca6b
font_02_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16784 bytes
SHA-256: 5c50aa2fda8f10c884a4353c9df6dfdf8f51d85d8e0f0fe63c804d396064e995

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