Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c5661c6b8d85ac…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6de919b016bfdb46f4ec501725048efe SHA-1: 767bfab2667d501d53823e70c878352f78f8fee5 SHA-256: 72c5661c6b8d85acbe300a3dcc5ccb66d483fceb34e4f4bf9d1f082397ee097f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with URLs leading to PDF files. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5df23668a---sizamewitazadigide.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/suvezofuwigokedosade.pdfIn PDF document text
    • https://orrizon.ru/images/file/70375650078.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/80478359438.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/818687562.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/38245388576.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143073c8d4c6---49707864341.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/75252858854.pdfIn PDF document text
    • http://akademibt.com/resimler/files/84957994849.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/vugogomifumi.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/37712857380.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161397b1d5e4bd---93344013743.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/89796295935.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6134fe8a218f7.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/87911380847.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/pujedizulamabulovifigo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee2c585c3---85498258229.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/62544328609.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e65ac71cde---kunan.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nefazav.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/60019967667.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/96654289794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+cia+filesPDF 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_off0000ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 10392 bytes
SHA-256: abefd8b66a04627c7325c0f6f4b7c3f1a8b4b1f298088ec424354949fd95b631
font_02_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 17700 bytes
SHA-256: 9e4ec3097d6a61f3175feec603f502e515d4d1498f764141e83c1e411976f96f