Malicious PDF — malware analysis report

Static analysis result for SHA-256 a734d82adefa3776…

MALICIOUS

PDF

147.2 KB Created: 2021-09-07 00:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: dcf244ac25addf5e95941c551582a05f SHA-1: aeec60cf082acb2341be0e1c1380f9f5e6ee36cd SHA-256: a734d82adefa3776a90e666e48a6c11a7ace31a21d04c80ac92b5f8cda3d5cc9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, likely to execute a payload. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/697c60b5e9d580ca573b069a6d9a05d6/kugudepagisijaribaxaje.pdf In PDF document text
    • https://ddnepal.com/assets/userfiles/files/wavagamuvinusafa.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810037e8ac2---jutujelajawipivukofibo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/68d8hkc83pj0e3nou49jfouq9u/28909055929.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb91493d5---25660845314.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/475189825.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/dofizilexokunufok.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d97e4f483---22446183571.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/tovuxipurazudagurufuzova.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/poxusajigejozinaj.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/94829813063.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1e232e9222d2e68ab2d7807ca3b9f847/67374842258.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/59193581063.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/mumubaxixaporal.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/2025924669.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/82052824072.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/73957779935.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rpj1n0fl3i28r1gtl0a2tl6ct3/91865818390.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b3b721b29---nalokil.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipsjh39cjppmjq81q6e004fqm/bodapibukef.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa69a0ede4---61669747433.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b123840a---lunewupagemusavenusofa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71be16600---93878144037.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/zomakufuzibikiligefu.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/74777331419.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gipapopetolanovesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=arista+switch+manualPDF 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_off0001d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D968 20224 bytes
SHA-256: 15b55e986562f8dcdd39fdc77eb4f00b7d022a4e10ba63aefcd374ac106b1e69
font_01_sfnt_off00020f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2273F 10408 bytes
SHA-256: 71bd81e01dd7f537afd95c14920890b2aedeed23f31eac9ce85a0c101a8b4b84

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