Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66fb17ad6a81aed…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 06:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5181e8276ac2e769edb477046add3e8c SHA-1: e68ce0a52af883c9c2f350ac0946f7a16dcc0d9f SHA-256: f66fb17ad6a81aed9edb5843ff9fac006314c6864c7c4519ab0f60c0747c2832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/474ee5b1fc5dfe3664bf68cfa95078b2/murexepabo.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c1a765204---pubidimog.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/modavamujovewusaguwidepi.pdfIn PDF document text
    • http://furniture83.com/upload/files/wovadosatofela.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6ea526db---duxarar.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/82499255328.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/60630157253.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/99190402220.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nmoaf3ha6fvt7nfqjlqjtkr2ej/sudobotapuvavidupefiku.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/kalegobodedezefexumavazal.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108200802213099.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062706170973499.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/melijavowabefenaboda.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jegazukafabixitajomepuzap.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/kupumoxar.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e088c1b7988cdc4e74b2ecb76de3dafc/14244694389.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vdl8t8efijavct9n8aim8mngko/22535399521.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/depibumovokurebig.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c3008ea39---tijuluwewo.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/gosawabatulegubenunosora.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1104e8c737a1800cfe0be1ea73a36f9/sojabefuropinemazagusurop.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dce430f5---gagitefanugonerubarikari.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/29918947012.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d566d54d3---31174489276.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/66152408711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+uv+to+tan+outsidePDF 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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 10312 bytes
SHA-256: f011822bb0c24993ea73213d61dcd0469c2cd7e9c1cbea1aca432c276ca8352d
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 18348 bytes
SHA-256: 0f074f22524c699cb89ffb6ec76ad2c2546f3c23f7449acd51a07437e02f3319