Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da0f8d1ce20a589…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 03:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e41f5a898f67ac861888f19e1f5d1c9 SHA-1: 57cdf2308adea51e09ddb4bf8e629a0d6b5148b9 SHA-256: 8da0f8d1ce20a58985c7903686957c4bf3c535f6e6f2a08d3e3e1d13ba855cc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=bitlife+full+version+apk PDF link annotation
    • https://casabresciani.it/uploads/file/kukonub.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/46908359837.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/kuxemuwarapavojewiru.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/88271449338.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b45ebcf494162f850ca387c626ebbabe/zepijugagabagag.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/pebuwegew.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/10940874814.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nisarureni.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/kofaw.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/zuvevag.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/gezujolegajileku.pdfIn PDF document text
    • https://gulamanis.com/contents/files/dokax.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161461ffebfb29---98980924559.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/wetuzenatimoruxisoxatizuv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a037422264---62681508637.pdfIn PDF document text
    • https://castel.ro/userfiles/file/95321941073.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bokuvosexibivuki.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/12542431661.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4931498c---17098257996.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/46978425020.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/82292721681.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/xusasak.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/40119924491.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/9373437310.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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 10660 bytes
SHA-256: fccc7a4f82142f77cb9e82b465b0d19fd1bf4350104f9935e2f7009b847a9076
font_01_sfnt_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 17252 bytes
SHA-256: 56558ad07f4718eaa6060dc206264de89b9dec3e95bf80f87db617812a3d4056
font_02_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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