Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecb07744d5c0aa3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 17:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2720c2b709a574b5a8795ad78c78a321 SHA-1: 3b0936c12229170195d6ed554d05b7c43a3b4e86 SHA-256: 7ecb07744d5c0aa305cb33f9f4e80c83bf15ce071ba97070638a45be331a355c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://satuldelut.ro/ckfinder/userfiles/files/71050043980.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138218e21de8---mimidipoloraf.pdfIn PDF document text
    • https://value.ae/userfiles/file/perulejiwudanuxivemonoleg.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/18329744729.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mibuvumegunefakipo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/fonaviwerumuvosebaxawod.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/82581079479.pdfIn PDF document text
    • http://strandedtattoo.com/file/78991569986.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/vujesiz.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/buligalugatawerus.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/tepukati.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bob0bb46g7alq6rofukltgbr9n/6674993978.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300abe6ef91---fananuka.pdfIn PDF document text
    • https://jck.ro/userfiles/file/gazatakenawafaz.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/34773415032.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/bubitotovoritivarer.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sokokinimalakipomuduneze.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/pununisibakunuve.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/nebolexatenu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/pababumosogusizopazap.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499681ea80---53065811620.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/zowabox.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/22620110518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jurnal+tentang+tekanan+udara+pdfPDF 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 10476 bytes
SHA-256: 30fed627d7112a02efa758809d6e825f4d5a5124716f56b1f1510f8da5868187
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 16848 bytes
SHA-256: 6f974a28391a99bd8b26e833e86ca2db30cb7fc252cae401f7ed4126c2ad8970
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1