Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3e1714059d0c43…

MALICIOUS

PDF

94.2 KB Created: 2021-08-10 08:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71d539a206df1c9089918855c30df7dd SHA-1: 4eabe69e9b5294bd8f5ed8d67f338fb61d6a50d9 SHA-256: 7b3e1714059d0c43725e03d61ae2726ff563ae239fd8160e88349aec594a2aac
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious URLs, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3ae8bab547348c26ee5ce3dc0dfbdc46/kafod.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/84203786570.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f1340328c49bc8cb4b990414a4d9baa0/50700920616.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/97791860914.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac105be9---99318656449.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sexevegibezopak.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096d28b92cbd---xukurevajenetatit.pdfIn PDF document text
    • http://samtekelektrik.com/files/11069432299.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210727_171226.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b116f91e8f---beriputide.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/zivorisumik.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb0cd7dbb---jatobisawotezuwiz.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/suviniwewabibonun.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/sebujetapanubojetekunufof.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/412b48bbc8947a2b61723159f7b63030/51230289511.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/81380671030.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/sazomafo.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/rupomajug.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9p9btdu61pcrerte35djupg303/84449259279.pdfIn PDF document text
    • http://praguetransfer.com/files/file/bapejaturawujo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c6fdc8484b8500110ab921bb780a4430/baligamuz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c15d39eac.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+qualify+for+capitec+loanPDF 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_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 17488 bytes
SHA-256: 8ad4301695e85e795e4ce0c9b43cb36f7a3321898b6ff9d4ec5b1734fbf5422c
font_01_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 10744 bytes
SHA-256: 7bab7a7261d6569f75b7f026f25301378bbec86cb86434877464f45887c0443f
font_02_sfnt_off00015229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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