Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542af85949ef114…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 04:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb40679c9995d3735c3a70abe3fc141f SHA-1: 3a2fc5f1c9dcf454cd356321302f9daba019f12b SHA-256: a542af85949ef11436414dbbd9e539e8ebb4dfdda1529c6fcd3fd50d815578e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://moraure.net/js/ckfinder/userfiles/files/kufafukapopufibunoded.pdf In PDF document text
    • http://www.examnotice.in/uploads/files/59599029816.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/gedevemetepisarosulufeb.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/mamaxikupevetig.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/79472808675.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pexetunavoselujimuxapabu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/zaruwikakozukagupe.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/99231249223.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146434f4acab---muwanakafinimijesosuk.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/92820682514.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/pememarilaxe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130703621ca8---bimevedekugiz.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/54162718945.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/70624245800.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/96343888090.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/bumemetojazuwu.pdfIn PDF document text
    • http://oodow.cn/upload/file/210920090148759210616d3pfdw3av.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e646744e---61275277210.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nefoku.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ffe3d7102be76a26f5fc3adecf7297d0/94112725631.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631335580.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/aa4f2e3395ec3bb86873b4ca5ca3edad/winajojixekowez.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/75266033366.pdfIn PDF document text
    • http://ukrfirework.com/images/file/94618915910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lucky+cat+gfx+tool+for+8+ball+poolPDF 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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10872 bytes
SHA-256: a59dccab0c0ccfb3b0b67ca0a6d47a20f9339e6b31b9447c6e1917860e234f57
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 19432 bytes
SHA-256: a3ae1704b13dd6740392a604a049d7ef75a8457ff30ea6ce3b59ced466afc6ad