Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ed7d41025a8c9a…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 25edd785c695b541d071104357cca39a SHA-1: 4214eac117e8747ab4ac2f962dc70f42cbacc701 SHA-256: f5ed7d41025a8c9ae8942c850262231237abee9ec2531bf9c6ea2c82ff48601f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive URL usage is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=melanoma+in+dogs+mouth PDF link annotation
    • http://elskenecologie.nl/files/forowa.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/bixuvatagezesoxuvalovi.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/63509482536.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/8f1684634a828081140056bdee52923e/52541884908.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3ekichfrufl4kfhracriafa7dg/82202824353.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qeqk3cjhq946l0rd74ct4cdf4/livelapubejobowolotum.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49626d1259---41345670681.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5ad930390267d15293409a6735cb3ba2/siboradupe.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/94335936726.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9a5058a6179544e648433b6c22596d45/46265815858.pdfIn PDF document text
    • https://12shio3.com/contents//files/boxavejivatixexitumamuxo.pdfIn PDF document text
    • http://ausafe.net/images/art/files/gebevi.pdfIn PDF document text
    • http://olympusflights.com/files/files/13862891690.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2bc748a5aa6c065abc5e920f61ef681b/28125939691.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nfnjh4urqh0p3ccq1mbp1c7ii6/39689579564.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98348fe60---wilumiterafujenipigagubu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/997fd89df8d60391f5f5aae3a4ee6cec/3176574848.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/df3db22d2ebd13a4d20022552f564df5/82096900173.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/19031447938.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/i1kiqb3t8up6gh89uca0ro1l86/fubax.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60fd28972e---gaxofeligimododaxipowef.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/06d1774d783f30b527ec1b51859b68a6/kopevepamomowopejekinatow.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kesofofasez.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6546700e39---fomesazep.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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10688 bytes
SHA-256: 2253ae545bbfe526871d5c1bef655350cde69bf694cfee3ec4837e17ec46185b
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 17188 bytes
SHA-256: 95b4142b66f991788816137cab1790e545596c610b4fb6c838d22c7607457404
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1