Malicious PDF — malware analysis report

Static analysis result for SHA-256 e058f7313800df4b…

MALICIOUS

PDF

144.0 KB Created: 2021-05-07 08:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 963fdc79a80632d035a9aacbffe42bc3 SHA-1: bcb2f012de8839196e09284be43f34d543a0df48 SHA-256: e058f7313800df4b85e7e0354a1d3bf37fee21cf38e2999aa4ce6f2d16b3ac19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=fundamental+theorem+of+calculus+part+2+worksheet PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080000eddb71---33179733980.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160738c672c254---wawitoxirowujesaxu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd9fc99e5---pubugok.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094990f436d0---manimagib.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f152e3835e---27899214201.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e75be86183eded1525191ee22ed2b5d/baretuguzogaxulire.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o3bsfo63fg62ro0iahc67f5jr1/nebofozubukuz.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kadixebusadurajoxebonaj.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/m4f48765pnclgck8jauclo5blh/66903158588.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf74cd9941---lawimej.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606d636ab1f89---1182834866.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tqs9533u6qccteaoi8hi66gl0f/wujevi.pdfIn PDF document text
    • http://dentherapia.hu/files/file/22365703614.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f077b78038d22d3febb2ca358b4d81f3/xijobelujaburuvoxuruteb.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zigobigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA79 3588 bytes
SHA-256: d252989ecaffe78cd215089c626b3748ba9a17e324a63ec4b2ab785902fd9799
font_01_sfnt_off0001d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D754 5636 bytes
SHA-256: 63cf7d13dc6bd4dd2077e56c53b929bb3e8e8d9d3c9279cf1dadb93ea9a0159f
font_02_sfnt_off0001ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA71 16528 bytes
SHA-256: 78c9aca592140b459db4de415dcfffe2296e90ae573c401506fa2eda6b01853b
font_03_sfnt_off00021c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C30 16152 bytes
SHA-256: 49d40f4ddd24418d5817f022762ef8d2fdc1972f86075e8faebf757ac94ff1bb

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