Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1b6827d7b7be8…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77757699c168b4edd00c9a7aecd82c02 SHA-1: dcb8dbbc0c12a58a40e33b1dc8e90a7243ad18d2 SHA-256: 9cf1b6827d7b7be821f10964a3b89bb9013fa731c269d09fcb01de66a06355b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the links and the detection indicate a likely attempt to exploit users via malicious redirects or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bienbao.net/uploads/files/82919349971.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/89497322513.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/76424205830.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0270cgl6gerhiuifb6o1tf2nih/kilererowuroxo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/32039484899.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/dowenalelexegirafiz.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/basenabifubefizikefaxukev.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/99ee2dd6fc39f932dfe074f79a098c08/wovugemozofukudof.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d463467cb3d---vagaduwu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/aae8535e77a1565b48481615712d6700/87463062453.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a90aa4444c1efc48a29b2dbb48c73649/vodogobidemuseketado.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/teqkkfb82822j2efjr6mcj08if/vukepidodaw.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/71439966948.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b8d0067aa48bc90f0f2415540a664cf5/xadupuleze.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837bb97bd0d6662f9e38fd8a4ff76e5b/texevetemamusavonu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66c46f409---62737603306.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/67637584240.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nenogukuzibaviba.pdfIn PDF document text
    • http://cartopack.com/Images/file/824307686.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab991d178d---sudibunatixolipiwoxok.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/lijido.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8e242690c50cd924d3fe51c813a1113/balolivefumutitekag.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff79fa1cd10---33255984030.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb3e9b5ae---64096581478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+falcon+and+eagle+and+hawkPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 15768 bytes
SHA-256: b73822406d35bf3d217dade418ea50f4c4e5597446df855e59b662e9a7070c91
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 10904 bytes
SHA-256: 84801ec431b0fcc984309b6e2faa90ea91942752a26402771c14641fb43ec1f5

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