Malicious PDF — malware analysis report

Static analysis result for SHA-256 25da0c3d652a39bd…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 15:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6cdb8cb566ac35185743aeea34907dec SHA-1: cdce064d29a1a668c3d3f3294a913005378d3ddc SHA-256: 25da0c3d652a39bd91926badbfeaac2f843c0b75985254ea8bba3a685500edeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://loca-granderoue-montaletang.com/ckfinder/userfiles/files/2991744466.pdf In PDF document text
    • http://zubrcup.by/files/files/28645072869.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/40131746032.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fea78388027725689a82b63cda583c2d/17418900637.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasaxuzeb.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/risefa.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/zisirakujogolox.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/lirojezimukes.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/12363978186.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a5ed9d0d4a573e711b7d77a05b88b260/72115369286.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330592e1bf8---zazekeralunorebeliguweni.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/95591634824.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238af72373---xeligaworamom.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/rerozasi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/jelijisumetikawi.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/zezaje.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/vomavuvejidajaxewudixip.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/40907730960.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wupozevuboruzitepaluzed.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/61964383537.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/bajivajebupome.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161309a017ac7a---89493119273.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/koterexeleni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+thondimuthalum+driksakshiyum+full+movie+online+hdPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 17464 bytes
SHA-256: 4fd410e61d960dbe4ed3956c40cf344941d10a6a7a6d160c3636dfe50f3887fa
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 11104 bytes
SHA-256: a1303e45ade981cd261baf0f2c4bdc10e9de3eaae4ebd53347e21a45cc375996
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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