Malicious PDF — malware analysis report

Static analysis result for SHA-256 5019c712bdbc82c5…

MALICIOUS

PDF

81.3 KB Created: 2021-08-14 05:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6f6a771ddb2ec86c05cdc320f59e178c SHA-1: e33b656a87efc4234ac50446ff5a12e04f9d2fb1 SHA-256: 5019c712bdbc82c5f8029d94a7105e7c876cce707a9bf3145b8bd91216c5ca37
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. The embedded JavaScript likely serves to obfuscate the malicious intent or redirect the user. The link farm suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=minecraft+pvp+shaders+1.8.9 PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359e01dc71---pusitidesixuvaturofesarel.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/f03co32cbfie6t3ueh9pk9vhff/budewawirinafiluvawepos.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/74219222762.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/57498853566.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t90g0pelmb5b07t6kl5mulocc9/rurotas.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/be8f6a12abc5988a0d89f27e1d6db7d8/sipalajomofifi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zarani.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/koq85v1fblq57i23bct626a600/vojedopiladudatusavulo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/819bfcf3121c649d917edad377671905/fobaniribukusaxe.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/28909168789.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098642553a3c---88516970385.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/q780odu2norud613vcj1426277/35194050577.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/pegejagedanojonojuk.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/50834723093.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/20dd6623b3a0b0ef2fb4a5fa2e9d0d27/kibutinukowusunitut.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c554007e---2880500060.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hctvf0f1o6vf2jvgmqm2ul0mi3/rowakarijogawav.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/27624123519.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/gugaweru.pdfIn PDF document text
    • https://cristalensi.com/public/File/vevejuzeniwejifobutipomu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61e7d4a5d---rumebudetejutatema.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 17780 bytes
SHA-256: 246abbbb54e4bced07ffc5041662779662638f8623d8d813eb22c2b7a9bd3a15
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 11104 bytes
SHA-256: f5c41a7f7a52b387d8af037e9e49fd7b8ab860627d5fb9dc2e08f68240ea93fb
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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