Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea426dd63dcc1884…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 20:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a23d0b64d5e8522575d15f69e55887bc SHA-1: 4b1f9785a6a5d9f34dc9c73a019ba807611bff50 SHA-256: ea426dd63dcc18843b6877206141beefed012455fb0af091a401892ab6cc997a
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. Additionally, the document features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091279799e32---79405082774.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130276fe1a53---60644122161.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xolonamuluparimiperodaxo.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/31328049347.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa3189d34---demutam.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7a007d1a---89020459250.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/nukepi.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deab52743a---xaribujelumipagisu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/guzujusiziso.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tifilaki.pdfIn PDF document text
    • https://gencatakan.com/upload/file/xeduluturejufaru.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160deea541ddc4---91147170291.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfb592644---86793786392.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/keburup.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/notuvawixasevok.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c4d6770a---viveg.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/46944805683.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/lusasegezikadi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/32748888956.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/ganisinovemonid.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/61784319540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tawheed+pdf+urduPDF 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_off0000b566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB566 18924 bytes
SHA-256: a56a420f0d6c3cdaa8013d23e18add9bae89227b6974e9d7f09e64efd7bf420b
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10116 bytes
SHA-256: 0bba0da3b3d4c64fe5cde4506bfe3a1717d523a5039c6f3fcdd5f696ea061d1b

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