Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe023ea74b2914d…

MALICIOUS

PDF

153.9 KB Created: 2021-08-16 11:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2517c510dc1391d028b6fec415e4b068 SHA-1: 6ced48a17c6faa3c227e1991e64d4277e63bec45 SHA-256: cbe023ea74b2914de5cf42ccb318110c19ee02c6681a5810522c27c7dfd139e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism. The embedded links and the nature of the heuristics strongly indicate a spearphishing attachment leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ba37950a32b63f703c67d6aa3d46235e/viban.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac3ccee06---pupofadibikur.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/62965730130.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/fadugunidu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/58630293431.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d894e6c67---nuvimunova.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160999faf4a96e---teritererujibapetosevezo.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/78940284216.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/kukidudesanenilutivomebar.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/12564395456.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579741b936---72802840282.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75587539024.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/rotado.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/kezotuderirumazimome.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/52450172274.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af79b432741---96600960625.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a03c5f0578b75915af9029a925c7a12d/49175168732.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0258ca41644632908195b9ce6886cca7/waxinef.pdfIn PDF document text
    • https://yasacompany.com/upload/files/kaxab.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/29219128831.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/sipuxuzarodaligi.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/raretosukinobu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/75159575877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+message+of+the+poem+chasing+dreams+brainlyPDF 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_off0001f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F64B 11312 bytes
SHA-256: 2d0077249fcead260a702a5a277680d93a220c00cafb9595e19bd07e5bc1eddb
font_01_sfnt_off0002104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2104A 18972 bytes
SHA-256: 6561790f734992532fa6a75eb8269fb159ca468b16e6dd7cb3385c393f96bf35
font_02_sfnt_off000240a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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