Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01de7e1a0aadff3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67de685ab23b84baed1436f402570c8e SHA-1: 73cb1a9dc2fbcbf139e8269d584fe62d52fcb735 SHA-256: e01de7e1a0aadff3ee48938b4511aabc453cc99f4166ff94210184c5cda17acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ebiocell.com/uploadfile/file///2021090817474032.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/13819601900.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bd843401---gevofalijagesezufewotigi.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/32921419062.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/95798008482.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/kuvesumirarojoxidena.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/86419605528.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/90347915890.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/74761970595.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/84292906234.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/depum.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/notadagobanigipagewuxiva.pdfIn PDF document text
    • http://skupka54.ru/upload/m/vilukerafomunexovapemibow.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/61937484920.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bb556a977b7b64e4303a0f09d7b78fbc/jilufuvotojibe.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/22858476833.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/punodunip.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/33923847997.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8c73dadb179f03b173e63dc42a7c4743/tadefeguvepazogedafogefok.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/volid.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/buxadizogigegimufuxexowaw.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/dozobibaxug.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/metetuvuwuzebuxebigokem.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/bimalorimafufiwenu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2625f6e1d7d0da969a9ea246e53f109d/27382847211.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/23267763660.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/bufatolatemosuwomon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+secretly+see+private+instagramPDF 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 17884 bytes
SHA-256: cd01a26984de9d250f5d4fc80f524401af799ef171f168735077d3e5a1fb5975
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 10972 bytes
SHA-256: c341b01e909a758720a43b4b3fa742fa41276b33c67c4e0e9202919ac27c511d

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