Malicious PDF — malware analysis report

Static analysis result for SHA-256 f848dc6a1130e11e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66eb9519c03bd76b162b6f69fc013ba8 SHA-1: e6e515124166f07a1277a5486b8b882a0e197309 SHA-256: f848dc6a1130e11e210767a1ac2ac6ba2e3043d9c2c7245dbb16924a199ef1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
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. It functions as a link farm, presenting numerous URLs that point to potentially compromised CMS upload directories, suggesting it's used to distribute further malware or phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://barcabianca.eu/upload/file/39544922353.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/koburuparatulir.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4e8ea627c13bad7bc3bec28758b12b60/94119510218.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16099e89e35194---paminanevojivibakesu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/31383818797.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/25935236980.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/84la5ajh3ksm7pgrdtblbgbip4/wirutugivoxokazaxefegimu.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/wuxejomoso.pdfIn PDF document text
    • http://webursitet.org/Files/file/32046170362.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/33178180766.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/31706611194.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/torelinifibok.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f29fd1a96---balatisowefemegoku.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd14acd89---99945870806.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/60852415772.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/65716694559.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/32409494911.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7503ef409440a6bf77c71174e3ff9f54/26224164376.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/tisuri.pdfIn PDF document text
    • https://ccskin.com/geektic/files/sasofisiveponilixuk.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7643476258.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waguwiwaror.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/49cc250b72ebc58cea0e66d356f0eca5/vasibedakovit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=applying+uml+and+patterns+3rd+edition+pdf+free+downloadPDF 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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 20920 bytes
SHA-256: b371f5c077da4a589931fa75bc537b0824d27ae61ae8b5b65cccb81f0e6ca817
font_02_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 11292 bytes
SHA-256: 32528928c7c2d8f16aff4bea5964a6536e12ed7680e1379fafb0494a997f610c

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