Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f2ba8a59c71517…

MALICIOUS

PDF

88.8 KB Created: 2021-08-01 16:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e814598ff3772f0523753728284e5f4 SHA-1: 559176cba38579fcf5346832669ab203c09289dc SHA-256: f2f2ba8a59c7151723932701dd011e77182d2bd882849e7dde972291d27d8975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382d68b002---99209752692.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7501d338---lomasoziwedaxomatu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062d547306a---67462749939.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/wijuwepatawujesir.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/takoxaviruji.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a172da26---fotefanom.pdfIn PDF document text
    • https://bloomeng.com/uploads/pemediloxifo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06aead465---23677427366.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f2533ee7---kavevobebezojupugamafuset.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/159a8c9854c0e68781fdd3e225b5b3d0/67070396303.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c2b3b87---latowemor.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/85685870180.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/39771884161.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/liziwusip.pdfIn PDF document text
    • http://stonebreaker.at/90980023293.pdfIn PDF document text
    • https://atrax.hr/files/83809060987.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/biteru.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/5328130119.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/mebuneredoviloliko.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/binosa.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/77956452612.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/94352334847.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072969a23549---bomanogefanarupom.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xorolut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pasos+del+metodo+global+de+analisis+estructuralPDF 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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 18536 bytes
SHA-256: 9932b7eb8152c669b0b40afc67f81494d8a968daf4e70923275cd68da95d8376
font_01_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 10956 bytes
SHA-256: ef784a5098bddd75671e12cddc889e7d0c4e9b719c7aa52460c1cadc275db019
font_02_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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