Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b1b4414351130…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b5ced6390ce886e646d7eeff97bd4ef SHA-1: 94c4101d87db11be3d63e35bea40d00dd5602c8a SHA-256: 3f8b1b4414351130d06bab7dfef0de68afee7c5982a83f50f9da02e13b3ba0a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=how+to+ace+the+rest+of+calculus+pdf PDF link annotation
    • http://akvari-um.ru/userfiles/file/98684686049.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/34324219255.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913b87344bc---waleriverurizelobet.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/da0590d9fcdfe4a7405ef191a0d35de6/napokapoga.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/icchoujefda9a025n40o9c15m1/vexawabopiputelatawifeb.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2eca3677bbf7756e2d535eb844ec4d0b/bazotubezepapujatoke.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f283dd845ac---dekakapekowowejuk.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/faravupidula.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/49335135039.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac0d01715---7233894460.pdfIn PDF document text
    • http://alltechsro.cz/files/55466253875.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/e797dace666daba0edfdabceb5cfdd47/mavogubilekewozolubojiva.pdfIn PDF document text
    • http://beta-rc.com/upload/files/85789597993.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/jolifidevemi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c508a11a719---45878175273.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7f004715d5fa7500ed5118949e6c5c0/dibezufavino.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbda23c9aa7---68480883500.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a17df0388---baxibagolanixenup.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/67236360572.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jeketipugaxivex.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce83c48e56e---sanukelujitaluledenogamob.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/74aa6cf50ad99fe4476a7858bf7fab69/xowaxazomademeximidera.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3b55f6b1e5bba752dad0a9a388a913c3/noxifijasa.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/joxizi.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080612540173499.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10696 bytes
SHA-256: ebf82f72e28ec9f97f44bf7147f7b239b49533de138b0e5407e20e5472ade4f8
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 17344 bytes
SHA-256: 7a6e3cb345e710dd152c731f00627f4d321039d8276ab21217e5971ad5bdda50

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