Malicious PDF — malware analysis report

Static analysis result for SHA-256 540f42daab7afdcd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 14:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a87583c1ea8d37f1212f55413b13f29b SHA-1: 84413bed29dd38817160354e55457139aac1763c SHA-256: 540f42daab7afdcd676f85981df28ebd93debab669b0dd06ee8df6188ef52e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://agcslohian.com/userfiles/file/tiwanexaxiseni.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b597e1e6b58191035c864bec56d784f3/loguruxegibido.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/namolibukiwejokobodi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/novetimujefujezasife.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/8495490743.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lonariperakozusizomokabu.pdfIn PDF document text
    • http://plise.org/userfiles/file/70336872375.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109022331174650.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vufaxekibopigan.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/38594799512.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/ribitezirokexifeteko.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161309f3b1e402---vukekameguz.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/51157726839.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/48299248595.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/44008478793.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/53490574664.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4b8e0ca5---69487443818.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/60447076988.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/34498676744.pdfIn PDF document text
    • http://tochuchoinghi.org/files/69477631772.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323695145d6---38463282032.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/seregafigekupopabul.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/43900593503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=golf+ball+in+stancePDF 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_off0000c1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A1 17084 bytes
SHA-256: d63c908cb843582ab747b4295b293097c9345fee55135c393b4ae4292b609524
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10408 bytes
SHA-256: e39edf2941d4cef342c10cd27f9900d55aab8b2fd1dcc90f1b9de4191d8f5a5d
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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