Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1ad5274f9d28ac…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 04:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 290f8a1269fabfa615354b4232318db5 SHA-1: 341311da96307840eb7c965212c3f2aaa5491814 SHA-256: df1ad5274f9d28ace8c868ac52bd20af6c5dc51fb42075d625e5e6a9de556046
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://batiment-tunisie.com/userfiles/file/veroxelirajabum.pdf In PDF document text
    • http://camel-republic.com/media/userfiles/files/71696964920.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/waripivikukibivem.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210915185606_cu2e54.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/31022187846.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jiwogukiwubok.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bolunixi.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/17880250214.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/84174463847.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149843968f02---pikovew.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/26579707849.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70524426973.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/renupeluxeximudute.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/58067163244.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/67774897015.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e1015905---32424755609.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/66971453134.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/73031405619.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/jesat.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041c94031f---nutef.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/10613697381.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/dusinidarovadasosiwoseru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+take+screen+shot+in+mobilePDF 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_off0000ad66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 10804 bytes
SHA-256: 1073600aa564bad595ecfdd2cb6d660df090d90750f83644b66c372b8268293b
font_01_sfnt_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 16188 bytes
SHA-256: 3be1aeadcdd7de56d122cb9abb3aad020118d0282994d442ed397527a46656aa

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