Malicious PDF — malware analysis report

Static analysis result for SHA-256 5405dd5260784227…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 05:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67e4e83d171fb64dbe6c2919ceef3822 SHA-1: 67977d1413d5cc006777451692a62f1fa715e279 SHA-256: 5405dd52607842279151d7379707f79d9f9529a038b4a9c6bf4e591c2f93a400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=how+transfer+videos+from+iphone+to+android PDF link annotation
    • http://glampingcaravan.com/userfiles/file/20210909205037.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fususuzil.pdfIn PDF document text
    • http://runo34.ru/attachments/file/rutefigipubarijifep.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/88578701563.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379de9decd2---nerekavuvisenovekopud.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zusojomoninogumamif.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/52225884275.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/wegufelenokuzuvemowamumiw.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4bds5dfr62gl48no853kufq705/mewed.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/9097304037.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45ef099e---zobujenika.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/47952446581.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/xapoveguxir.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nelabuxivekesa.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f33442339---21268383472.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/jenabovapuzisawosufipizid.pdfIn PDF document text
    • https://slide-bearing.com/d/files/55934266516.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rupenapogodekidewebirev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c71f89c---zakaxito.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/96283279493.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88981770939.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/27844819580.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/padebejozomobuwukezaje.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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 15684 bytes
SHA-256: 0c11d73fe347b524ab1c3f9728f575e9ec6e16b6c077bfca54bea61dc89e0548
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10860 bytes
SHA-256: 670198cfa585121e9588b261e0d059bfca78fe8697c887ce74da9ce52689785c

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