Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eb18a191b50bd9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 18:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2345a2eaf51003e2a479f5b24b1783a3 SHA-1: a9a5af2a2d59bb71761196cf292187d6150743ee SHA-256: f8eb18a191b50bd9a5fdb2d301a9e093d752f36b797a5d7abeeeae2db376b73a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=rose+live+wallpaper+download PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2ea173ad---54805127450.pdfIn PDF document text
    • http://coolscape.info/images/files/3003923595.pdfIn PDF document text
    • http://araratmebel.ru/img/file/75892563564.pdfIn PDF document text
    • http://progetec.org/userfiles/files/jevexabitebibiretegosiluv.pdfIn PDF document text
    • https://iwistw.com/upload/files/12851518759.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912200037.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55669889043.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/lulij.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lamip.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/67145017624.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462d6968fd0---80904542451.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/woxabulunukujiwewusiraba.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/61600184664.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142f29978933---timinixoko.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/41575571946.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/79002405743.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/10466952258.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/19026395682.pdfIn PDF document text
    • http://gabortech.com/admin/file/88865046977.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/dozexewikowugez.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/62314789692.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/jurebavajiwobifof.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9b63be960---56480552556.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/fidevagawivutiwusuk.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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 16288 bytes
SHA-256: 4797b201419b6ed7ecf7dcbebaadc456dd85d3c94364147715e4985d68c3f4a2
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 10484 bytes
SHA-256: fb1b851961f846ecdf92a7d8b3473c5b526a6dda32661e65b15f81a0a8ff5701
font_02_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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