Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448a32f4087b67c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 00:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e7277d3db5056fa28823e4839035c5a SHA-1: 0adf209e36b571c3a82957f048973579c2482072 SHA-256: f448a32f4087b67cf4872df85e32a463e9620a1f637298874e1b483b8ff625b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a link farm designed to redirect users to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=where+can+i+watch+blue+story PDF link annotation
    • https://rachelrom.com/rescontent/file/turofurazubokoxote.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10737061408.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/90387771459.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/berexozupedenojivifax.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gefetozukuwokafin.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/28552501430.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38534620689.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/gupazigido.pdfIn PDF document text
    • http://videocycling.info/files/file/52933912841.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/logawakolemorepu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/pomot.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceceae85e2---60887004577.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907200446.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tubejepiwo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7g8p46jk2nlchsmr58sft9qnkr/niwajovetawe.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/26767929187.pdfIn PDF document text
    • https://stormester.no/files/file/nifulo.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/nowujagosudofofi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fcd3d2209e49df8199d3781184738f51/86456550888.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/82370721204.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/kimobaxadezo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gowudariwizokupi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/1302143884.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jafetimedidisanowaxolotav.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/32817802506.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/37377965947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 10760 bytes
SHA-256: f93e69a4b4b739f08ac7219cc6035d61ed853b4d03cd213b708df2e9e545228a
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 18372 bytes
SHA-256: d7d177e74de93d245bb838b83b723e4cdcd6d0d5f7cbcfaeac75a8208f5fdaeb