Malicious PDF — malware analysis report

Static analysis result for SHA-256 5425e5a047f0ef56…

MALICIOUS

PDF

100.6 KB Created: 2021-08-17 21:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3ea8117537573f1480c34c6709b2a67 SHA-1: 9efd5c42d8dc9ace82af62be05f18b04af96d603 SHA-256: 5425e5a047f0ef56c3f19a08cc7b70340cb5247fe4fb0f1510a5803d36f7be86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cplastik.cz/data/cms/file/40558914700.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rt8lo20qlsss5vq0oen6mp7v0r/887509965.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/sanigoxojulegop.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086d82e2dafe---bokufotutumoxamexu.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210610021204_bowsyl.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210727_C7BB9BF14240C6D1.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/xilorazuvojomegezitudore.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608583996cea6---jadorosidapariv.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ffd3d13ea6b65e02b77be32526b0e4d5/roniturote.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1c02b11117c80b8680b876cac4b52794/24802750886.pdfIn PDF document text
    • https://bliznacite.com/files/mubewegudeguzigexunakunu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210815012614143.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c8879168---95677109581.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108131546126387.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43e78a223ff37823026df98b6b46200a/24596134944.pdfIn PDF document text
    • http://m2m2design.com/userfiles/dujusutazitoberomozafikod.pdfIn PDF document text
    • http://terrietanaka.com/library/files/zizavusuworusavawolonoso.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/29memhm3vr14qrqqc5q59m7895/8517451744.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/63998069645.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088945dd1f29---rajum.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/donajumuga.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/22047526999.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/reravufonejaxekabux.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xuvudukejub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=army+study+guide+nco+creed+audio+loopPDF 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_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 18072 bytes
SHA-256: 673e05a14bf672f754a52d3402c883b6fa0c9e0b38be1201c32f6b35f0f8b782
font_01_sfnt_off00015268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15268 11052 bytes
SHA-256: 0b79998f05d4f47bfee59bf3124d23ef732bda6ac368e3f74fe9b5f98c4d1150
font_02_sfnt_off00016bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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