Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a0088af8be3f3c…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 09:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c1549531f68bc438242cf97ee618972 SHA-1: d826a8fcbf9bef0f1f1bc9ee1da0adac8607d4b8 SHA-256: b3a0088af8be3f3ca7a29cf75b6dd6f6cc3ea5ea0731491c8dfb7760b3c01638
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous external URIs that point to compromised WordPress sites and other disposable hosting. These links likely lead to the download of a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=delf+b2+exercices+comprehension+ecrite+pdf PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6ff68787---57289891299.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/pozisoxedas.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/19239658927.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/589416985.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0f4c1dbbf45899c2ec81e30c5473f629/9023153299.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57782010303.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b61dca68708---60069570214.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/neduvafurataz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759630857dc---65077400377.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9744c7894---noxidobulujujakes.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/037b98966980021ecfea64045ee1de41/63955032651.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/l37un6npu97kg89hc5sac9lt60/mebatevadofovibodunika.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/52059981702.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/feniwonu.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9b05fc5fcb037e1a64810bae54575e39/nesafitupupopafevofujaseg.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/nuxuworoxika.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/4530414961.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/90d19b33b8b12026df7f94eea1390fe0/94924907303.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/82858028684.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/funutogopupadunipupum.pdfIn PDF document text
    • https://arendic.cl/files/mokekupojugadarobuji.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114455c5ad56---zibalapunomivo.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wojavuxekiro.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/zajitogibawoluwimu.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11088 bytes
SHA-256: ecd9d01960c1a2277505b60bda091ee47590754a8cf333f75bd2ecad72e1ad17
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 21684 bytes
SHA-256: bb78a0626a2ad93c20948d599fb444f9ce791efb603fc37b446a13d197978a8e

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