Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2375b98a74fdd45…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 11:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 776d5175a15b0438751ee07e89a1eafd SHA-1: ab9354d3ce7a2ac6e5015e29f0934bd2c80fb821 SHA-256: f2375b98a74fdd45720f70d12cf337e692ca1a2642b6e625f2c487a9c70486c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://zubrcup.by/files/files/33089903314.pdf In PDF document text
    • http://masterref.ru/editorfiles/file/nerekolevejepukutonog.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/51653196441.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/powov.pdfIn PDF document text
    • http://kelvista.lt/images/files/41111582085.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7cebd2baa14a9df11c38ef8dd5db45b8/mawitetenozexetasiruwibuv.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ijh5689qgd0s96ufnh2kee93q7/tubinaxolamudaxi.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/sorewosojogimavaralovesep.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9rbo2ir38lml15i7qc2qdspr84/fiparadinujeradavokosumaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bbc8ca135---15282777311.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ab874654---2146337779.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/22105473480.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/34023925589.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/17841328736.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/kijadegogogeruluw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1f25bd78ea81c3d83df76a2167db37f6/vejobup.pdfIn PDF document text
    • http://hydrem.ru/images/file/zekawewotox.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/76b0733540042b80fde68586a83fc7a7/zareloralivuzijojukibog.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/mizijafaromofif.pdfIn PDF document text
    • http://gabortech.comadmin/file/debarasefaran.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/gifiligamenalesesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=les+sacs+plastiques+et+l%27environnement+pdfPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 18444 bytes
SHA-256: 47f123587461493eae0259c41e4a82566e6c70f9e3d3615d63122e9c1f44ae67
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 11084 bytes
SHA-256: 34c65e1638fe316a4d2c8f04a362dd4d1f42150df744eae46cb30217bb5e9239