Malicious PDF — malware analysis report

Static analysis result for SHA-256 172b82f8dde4b9cc…

MALICIOUS

PDF

99.0 KB Created: 2021-07-05 03:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a69f9768cf1d0c62084f53ca842e2fb9 SHA-1: 3812029a4867aabbc7af68290a3014a08e5469dc SHA-256: 172b82f8dde4b9ccd466563a0320bf3b70a76b15f1a4f7e3e1df430b3b16772b
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a primary mechanism for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://huntic.ru/uplcv?utm_term=readiness+meaning+in+english PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efa1a7b92---voxovaxunovelalojaxasav.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b2a7f6ff04a0bb0297166e46d0e487ca/wokegoxawerazobirew.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8c75b5caf626b928c54d5acc60e6ae/durozi.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/77232770055.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e990231f8---tadupexomosoti.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/82588920299.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210605_3DED4F48DA1484D2.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c164a5d14---5898496397.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fb79afb9---21581506470.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831b6e026df---taluvusabodo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa2999bc5---fatidotavefimikika.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/lamif.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094025184786---tudukemowux.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d46292e36---81377312325.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4fc892a17870fb9fefd28a3ace522a68/vebugobetovodamap.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/xepijor.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/bmifdk76qkj5lrv2mp48vjtu5d/65703004428.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///98386580828.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gr28haudog0pak7e9f1ssb1d08/18706993446.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 10420 bytes
SHA-256: 915cc3538ac1ea1035de46da42f0960800c6a5b51b8e79fb8176586e0a93aae0
font_01_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16496 bytes
SHA-256: c2d38e31de1dcd0c1df0321d573b4d68f7392d4aa4e397e6b43b5a1801751077
font_02_sfnt_off00014f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1A 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off000164fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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