Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fee1723af9fd96…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca8cfed913d7c3e8dbcee1912ebca426 SHA-1: 693488de52268ac3a7f019352694ae7522f51198 SHA-256: a3fee1723af9fd9654b232b83e1914b04890dd4dc282cff346d8b656efe0a365
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lindendirect.com/tempimg/file/53949326277.pdf In PDF document text
    • http://year-c.com/upload_fck/file/2021-9-26/20210926164707512331.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9f72c00e---34060548414.pdfIn PDF document text
    • https://perbloland.com/userfiles/file/13753163856.pdfIn PDF document text
    • http://budka39.ru/files/folavi.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/85560663580.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/977f6fe10427b5d1286fd751bbbd52b4/sokomifo.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199185875733.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/jolewuxixumilimulikoxomev.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/xiluzuvakejexibuvodafe.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fomozunovukifoma.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/27805943500.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148bab7bbf8b---23868587942.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/96482ffcab1c87f3b0866bbcb1adeea0/20037699720.pdfIn PDF document text
    • http://quranday.org/userfiles/file/vunabudozetur.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/44571729846.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9843f4f75d5c663ed450071f13047579/wekadesatagizesakiwisi.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/74093349180.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/42125001526.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/82626026592.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2f9beaa3---33440776819.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/xaludixovidefexasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=can+my+phone+be+a+firestick+remotePDF 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_off0000b5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5ED 11076 bytes
SHA-256: 90c4262c0bea7652d7188bb51b5273e000a9fd9c1e9e3aa4255d0ed5964498b6
font_01_sfnt_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 17636 bytes
SHA-256: 2407f749f625594f9c21efdd92ad259770dcb42431ca2f892ba3980850f73701

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