Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eefd28fbc77a9a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 08:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7337a789cd23b74a758f424a360f7d36 SHA-1: 03601f7d1614965812f33700b2eb122c6dbdd7de SHA-256: e2eefd28fbc77a9a0c7db229f4953863e99a51d7d6f96fbdbce0a6dae4ea7e5b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://startent.ru/SITE/files/editor/file/71995622302.pdf In PDF document text
    • https://queensflower.nl/clientfiles/29108411536.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/xaviradaxesimomid.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5b2a8868---zojilekom.pdfIn PDF document text
    • http://northcity.rs/slike/files/jetovupani.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nuxavemonederij.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aq8a8bgn54i3t2dp9415rt1i4s/41071323705.pdfIn PDF document text
    • https://majubesar.org/contents/files/tedozozekeratibubipatak.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/20241695854.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/xakemiranodotu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/86558411640.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/gifivonusorevisino.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/21769590817.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/todenuzupeniwibativa.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/fabumegegerilitipeda.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/6911017668.pdfIn PDF document text
    • http://net-work.cz/data/file/xaxiv.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d227db824ed1371b1497868fe1b8e6ed/3254307019.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/73361158670.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/65909786292.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/ruwopezekukir.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=power+rule+derivative+examplesPDF 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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 16424 bytes
SHA-256: 9821ae90539da8160defc46f9675ad13b3462118529359cfeda25baf8203fe48
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10804 bytes
SHA-256: 868f5077d0eb4134ae9f90be5bb4acc6ccb5d77e1b833ba0a52cd665f6299738
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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