Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c723667d09d13f0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 21:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaebf6b58a8d863043a08e11553cf3bd SHA-1: a5ae22649fa06a05907c98bde0abd266cff98372 SHA-256: 4c723667d09d13f04017da8511891c5f582581fc4cd258364efa144ade88c93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vifuxi.pdf In PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/vikilu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/57737801484.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091014044432.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/98664974558.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1cc0809900b973a647a1c6fb6447a809/gafumidigosij.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceec789d3d---temudavoleje.pdfIn PDF document text
    • https://pmms-online.com/assets/file/gatipikitisalisano.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/nenusamamagar.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/32272789559.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubivl9k801fjq97h9983ea6i3s/jedotadur.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/73705853923.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/23339505791.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/97322718124.pdfIn PDF document text
    • http://vaithun.net/upload/files/13726818255.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/dokebexasojokaderu.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/89567866556.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80807362864.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/27227831071.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7c6ea236c869bbf294539e270999cde8/lajajekolenawezufubakil.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/tewogibevezubokon.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132788e8b4c1---zunodosexetixawebogon.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o0lh2tqhq74t8asrr2hev4lsee/gedukobudekuzutezag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+conjuring+2+movie+onlinePDF 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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 17188 bytes
SHA-256: 8e20572f17e286b6c832491db69b15a23c64e05bf66bd144497235f72e283780
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10628 bytes
SHA-256: 2d045e171d3f3f2c064561c24588feb3683932f842f8a404b3a62d7c165d6318

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