Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd898f64e8af2c67…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 06:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 562ab0a72ffc9e16b0db92701b4b7149 SHA-1: e60677b26b2669f56b58ec58b266c3ae823b8216 SHA-256: fd898f64e8af2c67bdee5b3a48edb418449cff4063a09c4e8fad1b69b42fb81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads and disposable hosting, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c9221f4acccaa5581d02f48f7db36836/64108482659.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210921_1E19193CCF76F297.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/45512133111.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/lodizivotomo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba07d76e0---miboruwemigemu.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/puxejetupuwigakot.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210923163240325677.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/safagilepurozowusi.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nutibekafi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a33f23954---47478732823.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b76d429cfd---54300044437.pdfIn PDF document text
    • http://info56.ru/userfiles/file/nukazuke.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/simipazisiw.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/24316494807.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/turozusurimedofujezite.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/35130399997.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041838551920.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/suditeges.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2b8884b6---ripikakitazokewenixil.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/71926990288.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109020554171370.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/tajerutijapofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=crypto+cash+apkPDF 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_off0000af2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2E 14936 bytes
SHA-256: ad817c3dce1a5cbf55b3f6b1074eaa35f70e38cd2d8fbb1d173b309a67cbe071
font_01_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10332 bytes
SHA-256: fa565f589909e3bd35ce29b023afbc2eb83af4e2da759b09bd8aceacfff22388