Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2749a763ae877c7…

MALICIOUS

PDF

88.8 KB Created: 2021-08-22 02:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28325e9cd16bdeb00d750ff29a69c69d SHA-1: 5420687b7f5f984ecff0d504d49a81fe54152f33 SHA-256: e2749a763ae877c772b87f28dadc00cf7b83ab4706dcb62f375f8af544dfd87e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to act as a link farm, likely to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/97a2f39aa31acdc6e7b89100ee7adce8/90429278469.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/wagoripov.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/12594744439.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/en1sg84s5dujscuvcmt4f6dlac/67564708500.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/15453419452.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b663dece1---tekolebororegibe.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zudelujisomoxiru.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/qg0l2o0mf2dq1oedgjmgd53tcg/11228459984.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xonijetatiduvapawepolu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/xatexerotegiduwi.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/fatojuxu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160da6a9bc0841---kesaguvibigisiwu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608694a7b9591---levetaxerodum.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c6b0f31c0---muvepenawadonerol.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/rofozaduvujubibujif.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa54a15d91---witokije.pdfIn PDF document text
    • https://kueapem.com/contents//files/murulatixize.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/85605410093.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/majignc0q34f3rk4g4kj713msk/vulasoxezewulorutado.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/xigunegupa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/74te7b2jsh03jnrkti7tm5m924/subirasokuvexi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f32d00f232---getenawivejujinuti.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b906e05381f---21019209965.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/72838790892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+movies+has+captain+marvel+been+inPDF 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_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10840 bytes
SHA-256: 7381797c5602bf55477b0682514e6d352f27819e5cc81d7e9c330e23f593864b
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 17788 bytes
SHA-256: d01721a80dbbbf9192d436d09d22498bed5a998d075978562114cfae2c39fd9e