Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a8e3fbe65094ec…

MALICIOUS

PDF

91.6 KB Created: 2021-09-21 07:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a87cc9c7aedea4de04702cbd0bbc4c40 SHA-1: 0812f11b0157e078d006a420c426e2aa6deb21ff SHA-256: 99a8e3fbe65094ec0e1dac54877a8e8d7f0f51038406955f8bdf657f8804977f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, potentially exploiting vulnerabilities or tricking them into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://smidgel.ru/uplcv?utm_term=free+spins+no+deposit+casino+australia+2019 PDF link annotation
    • http://stoka-saarlouis.de/userfiles/file/90683031029.pdfIn PDF document text
    • https://ms02bet.net/contents/files/widibujusaxepofaxi.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/turokirijojavisewener.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/14520011154.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/63762998533.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/98391045392.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006e5ccc96---82127905323.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/6147835304.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/buxadozavisoxovos.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/196e1bd8e30c7e91cb40a1a65dcfcc21/wafilixonaf.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/makonunu.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/61013436031.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/5465770845.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/73950365046.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58725673234.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/63744691950.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/22477215101.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ee82c65659ba806bb2f2ee7aa7bd8f26/kuwigigaxagevoxevesutoz.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fajed.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219441473696.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/68638567250.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sajalabafedo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/21682646059.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_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 11048 bytes
SHA-256: f20c84c450a690cddd30ddc5a2fd3cea4ae5d209246185f093f15a7be49ff963
font_02_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 18552 bytes
SHA-256: 81b5bf8dabda65bf879a2170d071af37cb59f5beef0ee3a470feefa541e2268a

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