Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb1c4245eac3c0b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 05:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98b315ccb04280d0cb699561c8097990 SHA-1: b9a8580da7892cfa1ad4cd1939ae3bc539380fc0 SHA-256: ebb1c4245eac3c0b33b3e85c068c3f16f7513b67b62047a57c03e5aaad1602be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, rather than executing a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://americasbestmanassas.com/uploads/files/kikifiruwadatomisuxu.pdf In PDF document text
    • http://bjqyms.com/filespath/files/20210910084749.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/7473836110.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/80552256598.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/15423235550.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333e54b24a---56770803577.pdfIn PDF document text
    • https://alev.az/userfiles/file/9937422073.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gubosiliwozilujok.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/jaxitigiwumafal.pdfIn PDF document text
    • https://sentralperdana.com/file/winox.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sogumesisuvazobarele.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/57303738408.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/90943878847.pdfIn PDF document text
    • http://weingut-suppan.at/files/42235127307.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8d425b0af1694e638d3b8260269cfc15/83063599704.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sodinonexesiwakudusijo.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/285250941.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f4682e4b7932d176bee55207f75d189f/gademuvasonudopeg.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/25646109433.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d346b0ee6---batixoga.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/15822693047.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613096c672f50---vuganozipunu.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a71f36fee411f5a38b0466d6f6071af9/junidilogemojadisugokali.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rekawikufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+picture+blurry+on+androidPDF 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_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 18320 bytes
SHA-256: eadabf92778400148c159f0cff3b07492621ad25e83367c4f355087548008548
font_01_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 11032 bytes
SHA-256: f7caa1740fadb65b87eb22e3d30fb19f71df0eef6bbead28b5f74bd1362dd6a8