Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a5380f8984c4be…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 16:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d537a55a6f808a8424b850b50925df1 SHA-1: 9c12e68b1f8e51bf7660e4e8a2c5e1a929eab933 SHA-256: f3a5380f8984c4be830b68fa402959aa132f80eeafeafd32e590b446d74713ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the ML classification indicate a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=index+of+series+reign+season+1 PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9c867b6314d0a15dae474b085c93eec4/pumokusigomevenuzi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/vazijimesujumet.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/wulabegije.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/kaguzuxalewez.pdfIn PDF document text
    • http://chinalabware.net/d/files/lusagefake.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/15166622600.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/24050207221.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/kixigorezuxoxekijax.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/tuzex.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/66168717282.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e63e5bd84088769be88d2930bb498da6/50115913839.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/14096357217.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e7a8ede2---20607001873.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f35760eb---94705146062.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/22849458405.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/94953902473.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dataxidowaxiberirit.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/34705789813.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/1956693484.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/12653729312.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d9889ee7---sasavezilib.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000128ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128EF 19056 bytes
SHA-256: 7d4a738bc76bab15ec3878348b657ce8a576442ed9054d5ee85eb3ac372a5d38
font_00_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 17220 bytes
SHA-256: deaf13788005ab41ff1a80996783adaf3740258caf75c24da5021bf39bc10a05
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 10488 bytes
SHA-256: 06b9e76b35d0ecaf27be816c5aff71b807ce89ee49066fcd5016f504d8fdc86c

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