Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5f3ff42b1f876d…

MALICIOUS

PDF

91.0 KB Created: 2021-07-23 01:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9831bdf5a66c567ca8c967343de6313b SHA-1: b48fdabbb1aad358d50ed4eb42427043e436292b SHA-256: 5e5f3ff42b1f876dd38ad58a5bd471bfb0504e692198fdee3c4f11024bcf84c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77177785c4---77187096733.pdf In PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/vilodujonukenovosud.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f6223d5d2---jumufudidilewi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/ladoxutud.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afd453cc6---kajutirulujageg.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/10132875055.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074751fad358---88222213463.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/61142190082.pdfIn PDF document text
    • https://norservis.cz/files/files/dopuvuvesidiv.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/saduworisiber.pdfIn PDF document text
    • http://learningkey.org/userfiles/tafumatitupuluxibegefelo.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/12812665268.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6af0018f9---65808631444.pdfIn PDF document text
    • http://maihome.hu/admin1/file/lazipa.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/71584229404.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/lebuzajower.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/vetopadonatubokedigi.pdfIn PDF document text
    • http://www.heksan.com.pl/file/naxogosibasenosevimagazu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/tokexadibivulonikexake.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/palotenosisi.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/2193411349.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/uurki937uhu7dninc8cncgj503/95669140487.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbba02d46a---6885802183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=csr2+mod+androidPDF 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_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 17568 bytes
SHA-256: d1fe8f44fd3796d0c710f2dd91eb60005e427db3152443caac466fbda9fda36c
font_01_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 10284 bytes
SHA-256: 774015496dcd9a1af6e034833d89b4654d3bae396a6887bb5c51b0b588e76a0d
font_02_sfnt_off0001459f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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