Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e9d70fa07c0deb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 22:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cceceb3d774beb9ebabeb29a7069f34 SHA-1: f19c52eff42b4c77140861ee4b3e03ff5b34f3f3 SHA-256: 19e9d70fa07c0deb45f97a752c7a877a4c777a3ff204ebdc4df37dfea7d8b8cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech support scams. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a distribution mechanism for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=nss+enrollment+form+pdf PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/64230e77295724979a87eac89f18c7a0/55182755913.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/79695951282.pdfIn PDF document text
    • http://lawngo.net/fckfiles/4033240694.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba1f08abee---retogixovezukokiduw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bc65421f---47731782330.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/igpb5ri1bh4vnhsnjv9b4bvkp4/xaroli.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c139f126df6a1e522825bc80a5bee59/rowujefazizizozanuxekipuf.pdfIn PDF document text
    • http://jucal.es/images/file/87898124773.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085491d1c368---38618399832.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/48498309976.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lapinonovukube.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/lozakebilivugopinuwevepiz.pdfIn PDF document text
    • http://12shio5.com/contents//files/71864288858.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rixanolasu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/a2b342260a6f08d920cd308cf1b08136/valegupujilugive.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/lezebogabivopotisobelen.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108a7ccc4a5---tomanisejotal.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ac8370e5---depuzoriragadorik.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4694b9ed9e---30110189561.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/lupudegemej.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lomakolotor.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/67790691060.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77ce48b77---17003982474.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/ginizupik.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/61537763498.pdfIn PDF document text
    • 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 17552 bytes
SHA-256: 0d2febad3a85679b055c9b6a8b62c4941b81be0430841e1b325d86df76a49f1a
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 10384 bytes
SHA-256: 80c55cddf76bbf2f00b1a256a9b1dbdb60a47e0d581da4a89062202615a7012f

Open this report in the interactive analyzer, or submit your own file for analysis.