Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd423cd1558da16…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 04:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 455ae7d988c743df44178e55f3d4c915 SHA-1: 02045c27d1caece751c647831064896aa14acd9d SHA-256: fdd423cd1558da16024bef56c7a0dfef7e219e1fb958a97ed9311370f9b031de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm hosted on compromised WordPress sites and a lure to execute commands via the clipboard. While no scripts were directly extracted, the presence of embedded URLs and the 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggest an attempt to trick the user into downloading and executing a malicious payload, likely via JavaScript or by instructing them to run commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/02c685a3e3c212eb8f8a010674edef30/fadisototab.pdf In PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/niwotobaramuzajiwuwigate.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lukuwavubatuvoposuziv.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360ae84286be283bd524bde7ce2f9405/fupijotogaderemodikomud.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e8e2461b2---nekasi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f52536154---nokaletapulibetaxo.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/pizuzovarozuwogu.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zidubegunefumujeg.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1d863026---lijaxoduzedipesola.pdfIn PDF document text
    • http://ametansk.ru/uploads2/73870454853.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69045517797.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202108161534473732.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a4961abdb4cb443855946f127e26d1b7/86561554794.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/grofvrsdb574o42mcgl67lvor2/70935643430.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/kurudikobekofokefifet.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46a3d0466---xasutobazesibita.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f62eb8cbc---9632594206.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/21191646157.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/dutibivorazivutisaz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865e751137e---17274859092.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xukowidirapi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a476e85b7c5---38461932033.pdfIn PDF document text
    • http://allycatering.com/userfiles/nilibalujogowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tubemate+for+pc+windows+10PDF 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 18060 bytes
SHA-256: 75a7691cfb8ffe71c5100487694aefca6a64e48b89ac884ba44e460419a34bd7
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 11196 bytes
SHA-256: fe3e77feaff766c2d49977fdc70c1c1caf2002934b92f82da6fdadaf3ef0113e

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