Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4a096623a878e5…

MALICIOUS

PDF

93.0 KB Created: 2021-07-23 09:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32194cdce4cf1b52c0368d4df23fc806 SHA-1: ade01d33371a2b4723a0bd6ce594b12397c14a94 SHA-256: 1b4a096623a878e5a0ff2e9e8f42a593c00f9c9285e0b40fe587b10449540ece
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f494667db---33662809183.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26920c7df7---6368463262.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/89243697b248a4e423603a6655d87cb4/6728875587.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8174abd63b2ea4cfc6b9ca0d54a15507/96698326038.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/wemobelofuzakekirez.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074880e1ebb9---wubajo.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/kakasizanetigude.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i5eggajpshs6d9p6oocqjnqve4/82164650344.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/15083309275.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kopowodeminive.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cj2qv2k3ptgs6g9jmvq25ovne7/nepipisopofusawigaru.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea274a73d8---94117756003.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/zagupuwememuti.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/25846079536.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/uj6e5s3uckpsbmiv8b70n05miu/18093108335.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/63390274973.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/19422285989.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/komaxekakafusufil.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7b1d10fbc01f079e05a202712199d5f2/bijijosazezivitefijadasum.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7t6mlpqjbfbv6eq48at574gs3v/lapedofuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=all+country+currency+rate+in+indian+rupees+list+2020+pdfPDF link annotation
    • 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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 11052 bytes
SHA-256: a0fbd237210926739a41872b95feafddd9ce0cfff8bc1bcffe62a15b060495e2
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16640 bytes
SHA-256: 2885df834e6f64a9100671d6bf364e1b8ec4106130ae7dd3338e72ef3f0ba38d
font_03_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 19136 bytes
SHA-256: 4720fae8804aa3fb6b1076ebfd579ce4e05d65cc17e337842c9c73caeff7bd51

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