Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f8dad58bf8f505…

MALICIOUS

PDF

99.9 KB Created: 2021-08-06 12:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 380fe27dc01254c4df3da2565f5277b6 SHA-1: b1f7d4cdcbdcdd1f32c3fd597a4e3ad8a87f92d7 SHA-256: 95f8dad58bf8f5057c197c939be81204ddc5da8ab96e58e0f0e25886face9813
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://mebelihome.ru/upload_picture/wuxajijewafenerat.pdf In PDF document text
    • http://superplasticizer.cn/d/files/gitoxaxabamalidexoposaz.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/vurujulukena.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ib1vab9eib4ddi1q0gmhpcdhuo/zemizetatozotadipo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/68ab3b275ad05592ba9199a7c5d33996/49866418087.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/43741956965.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b49b42f1b---5524049134.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/fijavo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/16697280199.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607746e02bc45---3140647029.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06cc389bd---meragun.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/03a48f789b7614e62c2edac508a345ca/85411827629.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/87e456fc062f058a9030448365ff8357/59427324693.pdfIn PDF document text
    • http://keacg.com/upload/files/firemiwokuzegijatoferalag.pdfIn PDF document text
    • http://esangsok.com/upfile/files/pinivoba.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ea254406c188206d6a5f70728f7e3aef/pilekixazatabazekab.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a48e9241---fugekemowajolawafa.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/11207160518.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbfa4f02b---gosulujusemerufideg.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/430d027e25ca3a9af433761b0287b2db/63225317020.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c27170c30c5---31869888181.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/76842966894.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/337spb4k07ae1l335p3ecmb4o4/xujevubow.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f340a3d967d---80411673573.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765dbf7e9a7---7127565048.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/86102065921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=romeo+y+julieta+rese%C3%B1a+libroPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d4855ab2bc44aa9638e3d6ebc91aa867/27224709560.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 10900 bytes
SHA-256: 57d553e3dbe1279cd9cdabc52fa52f18e0479ab6e3dd55f4d4911629240aba4a
font_01_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 17992 bytes
SHA-256: cbbc353a3ecaabbe7b6327b1d2b68774bcbd116062af177457c10c883f4bcc88
font_02_sfnt_off00014dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E4 17432 bytes
SHA-256: 8a88d1a155d0909256469dcaa6cc69f0d3777c7536b7a9fd4b6ab8635f1a51cf

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