Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5426aa34ffb150f…

MALICIOUS

PDF

200.6 KB Created: 2021-08-30 04:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 18297468f09c97dcf5688509f60853dc SHA-1: cf05b510ba894d7d1136e613ce26c8e21c85074c SHA-256: b5426aa34ffb150fb4390f56121050c9fd5ea0421725f4e799f1d67b2091f190
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, with several pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9613

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.
  • 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 http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7b6672a24450877827b9b54b04d9367a/funabivonaxotaf.pdf In PDF document text
    • http://michael-dhom.com/webseiten/file/37327846509.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/34773779964.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/35150047824.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64116980705.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/zetutegubugijoxipixuxu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b384efac4---23422328930.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/230955115191.pdfIn PDF document text
    • http://armanetti.com/images/5383043903.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9bb83006e37a7b0755f6a5d2b5b612b8/36786376284.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce586ff119a---tefuma.pdfIn PDF document text
    • http://intergeored.com/upload/File/42289579242.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/99901154490.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200558462037.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6abf353d420012ddb053a795b94550d0/vogesiver.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/472d2a18382c23691ee08415bb29b33d/fopuv.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/62188867574.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ea75ba3e4ed8f6f34ec8154cfbf2d48e/bamukefuxa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2f4eea5b01cddaa25f42492a8e302aa5/mebemojegizudapakeg.pdfIn PDF document text
    • http://anpo.vn/upload/files/gapegepakenip.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2idmmejfrj6n7nhliioh19ca30/popetobutijufo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c049bf2971f---lojapek.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/fapixudilezelaboferu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=23+x+23+cm+in+inchesPDF 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_off0002b5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5C3 18128 bytes
SHA-256: 952b35f0832a96c0f655ca676800d15e9f7325666e3b493936f63b1311972944
font_01_sfnt_off0002e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB2 10268 bytes
SHA-256: a2411cce136fdbdc9bf1d2ab049b1bcb845c4c8d7f825aab0f0426fac33e17e8

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