Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69e0227ce5d1a2b…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 19:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8fbda08bcca20bd6c62a2e8ff09ab92 SHA-1: 65880502fa25dec4de4393e41addd5037dd79c25 SHA-256: d69e0227ce5d1a2be7ee95bd94e87059c82e4d2e17ec10c1f868457ddc64e7b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of embedded JavaScript and external links indicates a likely attempt to download further payloads or lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d32c8a1ed---47005235577.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/japikefedobuzopelifapo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160848325f1914---luvakavuju.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kukokififelikexikedanel.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/903bec54b971feed8602a83621e3f0c0/55779004067.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/96975018264.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6723c4e43f45d3b51437101f298be5a8/39748013001.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fe43ace6---woxukubokinego.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/jorojixop.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/tekixonufeve.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/ragatimexigebux.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608998ae3e437---mageforas.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4p3ae7ip2m3ac8tpa5a5h3kpq5/kofaduvuvetir.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb8998e85---49180346366.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5396b778---kodof.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wapogofemixozakiz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819633adc42---63857196213.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/tewugezunev.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16113238aafd95---ruliwudikibib.pdfIn PDF document text
    • https://asiapharma.la/files/files/xuvisorobozezoleb.pdfIn PDF document text
    • https://arerp.kr/data/file///6402372076.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudosobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ashfall+book+4+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_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10360 bytes
SHA-256: c688fc3c7a9a2abfdbe975c5f6d4e22e65d8857ef1cea2f47b14012f313066fa
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 18916 bytes
SHA-256: 67f9d87a22ac6d3384ca107d12cfec6bb242fa449e36869b2891a4be11870065
font_02_sfnt_off00014065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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