Malicious PDF — malware analysis report

Static analysis result for SHA-256 289ce0e1dc84afeb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 06:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 71274cf6ea23d0c2427259d00e7d2e5c SHA-1: ee9dd69504cc94f92be3d04a17f66b3b41167214 SHA-256: 289ce0e1dc84afebea11abd87020cdee95a59f8c212851d72822e7b87d5a3754
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier also flagged the PDF as malicious. These elements suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=battle+run+android PDF link annotation
    • http://pp-aqua.com/userfiles/files/sotowofedigenovadiwaru.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bafabapa.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/88104271358.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/tugabetotozezule.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/ruvaxorexikodekik.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/49298922522.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/xoxozatodawosikigusifu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613377f755ba6---8620282778.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xeruweroreweziv.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/wagofupenobagufozul.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/45065692168.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/38187844939.pdfIn PDF document text
    • http://nenorm.com/files/files/muwusojukanibot.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/61702057913.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/tukogor.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/57630226029.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/musirurevesibugoxigom.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9855bef100c4a3dc9c624ccb5e9caf06/juburek.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/81321821685.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16140c649a88a6---xozapevamakuveridu.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/32622114670.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/ruvumogokazebunebefibepaw.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/dejobopevog.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/zebumotimu.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109060545271916.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/rejepobi.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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 17232 bytes
SHA-256: d84a485d462242c3373005a1da0fef7fa57787c139eb423f389d4b6a7af8a17d
font_01_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10224 bytes
SHA-256: 4dbb5b89e2bb5b93a9839fd54df9761f000826f3ed56d86a3e6a41751c5c5fcf
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1