Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eed2d4e70cb7a62…

MALICIOUS

PDF

79.9 KB Created: 2021-07-22 20:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49aba47b457d09acd5df8420eb49eac6 SHA-1: 3ac27fda69502ab638c4a9d3836323fa98f82bb6 SHA-256: 8eed2d4e70cb7a627820ed8eb5dcddf9eb4412fc178e6a9507ac988987c40fdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on potentially compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to PDF files hosted on various domains, suggests an attempt to redirect users to malicious content. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://castilloexterior.org/ckfinder/userfiles/files/22794199088.pdf In PDF document text
    • http://shinies.ru/img/lib/file/64778086630.pdfIn PDF document text
    • https://strechybenesov.cz/content/negivawi.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/salitaden.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/towigutove.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/lugulifenazokabeka.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/pezezorufebobisasedem.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/pizafovajokewuzumaforirul.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/firobefusekeje.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/941e3a7450d3753899897b800c1a69ba/55369937398.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc62fe3ff5---20683260734.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/82860606962.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58d00a4d0---88295007535.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/dfae8bd13ae7a50be84b11967bf89e8e/mujepebemufozejivesela.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/46246798625.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98288e8cd---develibuwiranegojumim.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/46784308441.pdfIn PDF document text
    • http://willbramephotography.com/jasodi.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/komul.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9745d24a4---punaposetezi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/lemdh2deqmher7a4pgqrn07e03/numotow.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e79b5e9a2ea---moserixinolojuvurekumaro.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1b6e48fd6a42c2dd062795ef3727cff9/sebonevuk.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/11c123edfa92a170beef483172bb0415/kobazijekebazubepaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=french+to+germanPDF 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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17456 bytes
SHA-256: a7481371528b5fd62a1438c67fac899e6fed8f5f24162a2e107e95ff295a839f
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 10348 bytes
SHA-256: 38dbe9f8b92b1d3defbfc4d9364da337ac115a88ee120226c530b4d42e858a52
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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