Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe15e556021756b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 11:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9ee822e1c365dd8f81373c63823d597 SHA-1: 28d3bc874d5ff1f008ef43ff5f5968a6e4d7f918 SHA-256: 8fe15e556021756b6f9bdb672a358b3a513778cc3de9634de6d66d812200fac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, where the document serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://alate.org/admin/fckeditor/editorfile/pevudef.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7ccb924be90b6546a6d9b0080e8c7a44/7352983948.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/38586430272.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/86b3244b19ff2634be937fd3ef5cd74b/16808895746.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/kofuronopuguzomefagazew.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/43689092478.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/37222756786.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xoxib.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/60028702222.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b5bf01f74ecebb6a409a61bdc3707905/62748910344.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/bogokidakawawalipopezo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da0fb3bfe08---samimufelazab.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/kawiwalufadidu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fe57d79d---83783203360.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630093789.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/80206979394.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zutejesawofijilibefedewuj.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/bigipalenovajake.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/lebalunitivoxipu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6b84f186---tixepeni.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnv0jcod78h3g5jfq1m6ahms6g/77356840048.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/dozobererumijegozubivipi.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/vilimorudid.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f09669330---74581960449.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90afbd065---sonapezitisil.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/logijasadejalubob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=medical+tourism+singapore+pdfPDF 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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 16768 bytes
SHA-256: 9057b48caf1fc896aed33fb09c30c2573507c4818c3b82bbc7efdfeb5b4abecf
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 11056 bytes
SHA-256: 17c21aaa3f6c4695a4e2d67aee0b9fe9ede8be6d3366ef358b440a7063f1159f

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