Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0e367768e1bee0…

MALICIOUS

PDF

69.7 KB Created: 2021-05-27 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 607f279783db9a0653ee0931562b96a9 SHA-1: 5f8f6e6b659e289c1de5fcf0ee304bbb1da2902d SHA-256: ad0e367768e1bee04f403f78cb764eda9e8b759212e05d138e35e47698d2b03c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=top+notch+3+unit+4+workbook+answers
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3329b5db0b1cd3a56ad0d35588baaee5/24969736894.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f1624e03ac2fe130d6940cc87e670414/91618135091.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbfbf32f7---268870674.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a74a59402248c6007747235d6fb50c4f/xonesodapanoxej.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e128003fe08746309b8ca0994b12d9f3/82462948788.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ffa2bf52521cda44bc5dc5c1945ecc01/28543866956.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/1553c7bf55d2b7187bd764af221c7a49/25539605575.pdf
    • http://africa-emergence2019.com/userfiles/file/norurelerodirewawe.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f78bd9704de164f145804359b0d09e01/66901296648.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5facf7812dd79654fe697bac291de9e1/72884647470.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/e9gvkp3iqc2a9es6pl3n0tkvj4/jakaz.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/222e5aa4bacdf907c3c47f5911c4315f/buzozitawu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e413f203---kitemobiwo.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d583ed0a09---kokug.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bb674dc5eecb0850b0014118701624ff/kokotogotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d305.bin
bf92dc2047e72bec294487417937319f25b98de10ff628acb1291297f9664282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5484 bytes
font_01_sfnt_off0000e5be.bin
83e326fd8fa8ad77cea5f37acdbe8edeeb2f7716f05bf1d8ee6426727f2d65eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10660 bytes

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