Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f4290a9ed7344e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 08:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a2285eca1203dece5da068de8ac6d10 SHA-1: 5e946833475ab3975ad963ea551153acb71c49ce SHA-256: 18f4290a9ed7344ef313fee4757d8a8d91c269c8e51d2e4c1328bcb2f39d115d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to redirect the user to these external sites, which are structured as a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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://successalpha.team/upload/files/55738012777.pdf In PDF document text
    • http://cukorbetegshop.hu/files/50065268100.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34d8a62af84ec2979145d4dc309ef8d/2559676573.pdfIn PDF document text
    • http://fabriziochessa.it/userfiles/file/71619542958.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/97550312273.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xefubesonokizumotok.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/visenogekipafi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/af10d616bf42f80e2e4e7db462a315f4/78350210565.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/wujixajosezezagewun.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vorojajasapasulek.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/donigotipomud.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sobidupupotatoda.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161448779bd2aa---98879583863.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/23244813389.pdfIn PDF document text
    • https://olterus.com/contents/files/titazuzelosozoximinabimen.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613183a6cbb26---48078893206.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cf592a6---takezatimomavinigugofir.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/95900018994.pdfIn PDF document text
    • http://kbchina.de/upload/kamape.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/71517581203.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/27710486754.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/padofebosopanofafezalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=snack+video+app+androidPDF 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17332 bytes
SHA-256: e2f259131a643cf33d56d4f578c18e222ae687b12b29d10287f130438d160c93
font_01_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10428 bytes
SHA-256: 71ccdd2d2d7ea7e9f33b2e8c101aefd655ceb5e7a5ee8a077e180e297f517bfe
font_02_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1