Malicious PDF — malware analysis report

Static analysis result for SHA-256 e573081bcf6e0b7e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 11:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 740cd8c036070182579246e5fc417936 SHA-1: 801510ef9a7be08740c220136e53c3dfb1d26624 SHA-256: e573081bcf6e0b7e1837cf1c4cdc63b2f2bdd5d2530baf2a77dd4771d5d3ec0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites or download further payloads. The presence of 'utm_term' parameters in some URLs suggests a phishing lure related to search queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=how+do+i+unlock+my+iphone+7 PDF link annotation
    • https://gulceoyunlar.com/calisma2/files/uploads/joduziwegetixipuxowebadup.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/78197082358.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904075153.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd7cb10d7---dizaxoworiduzejesu.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/29669198891.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161307b9dca3fd---jotiraxud.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/mojovibo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/27883381976.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/lomifu.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/77763772024.pdfIn PDF document text
    • https://projetovm.com/uploads/files/bisewajivetenoxamajur.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/31376467696.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/luvukekarirodefujaf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671db895d1---4795308275.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/daxapemoxizel.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/getulofu.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/17154820032.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/25467506614.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/rawesavaxesa.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/77633747399.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/puxesumiridexobon.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/zuxafojunum.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161393408075a6---68208941052.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/46192317836.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/21622009038.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/xexelisivurorubudekanizos.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d733ef15---84421810372.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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 10684 bytes
SHA-256: 6a99d1c76b954638ac89de17ccc62f699417f7e73b6aa6f47ed0eeee69dc82b7
font_01_sfnt_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 15032 bytes
SHA-256: 8a62faa755aeaab38b9aaa852139ede6400e7d34439988e3e3bde15b7c89d83b

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