Malicious PDF — malware analysis report

Static analysis result for SHA-256 645239d51f225ba4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 20:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5168af46bfb71479099c8c4e34bda3ea SHA-1: efe641cb3e522b9d2a6734165f684b5b3b4b076a SHA-256: 645239d51f225ba48add94ec476e60cb92966a6798bd89c75dae140097e19988
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging embedded JavaScript or other PDF-specific exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://youngshiny.com/userfiles/file/1630786284.pdf In PDF document text
    • http://synergyproperty.com/images/files/74096160526.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/4021876643.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/jipimigixoxuj.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/dasizebegegebotute.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/34172959940.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/ratola.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902015209.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xarepizijes.pdfIn PDF document text
    • http://yuha.be/_files/file/xudosa.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/xanonuxaxeva.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161320d8067937---luwisobanulutenaziluvon.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138363407488---73288155418.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/golenizeforamigefazasos.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/3550908513.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c766a3b9---lufabejabuvavazaw.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f9ac04e1dad5dc98f9b0369042c188cf/wadazepabuwagimejogodojor.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/55961837290.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/buwulufozitudirumimuxe.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/87710446943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=starting+a+sentence+with+oncePDF 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_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10624 bytes
SHA-256: 4378afd7a53899bae39431ee4bd1251ae02a59fc31d264bdbe6ab941a8e0f880
font_02_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 17324 bytes
SHA-256: 4626f405946c464ab5123971545970e589f34a39b1be952286ffeca2429d4f1c

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