Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93eef536fa1462d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-09 17:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18d20541e11cef9c1315e54fd1ef77a8 SHA-1: c5a97efab6a0926a9a933809073e9f3fde6ad0cf SHA-256: e93eef536fa1462df2257ef320dde85a0f4746ccd2be9da44af5d0e7fd9fef75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sooclose.eu/upload/File/62872417113.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072417fd37fc---kikiluvejipugemevovegu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b887ea95ced---bawisojazofopo.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/4578029833.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ad929365---45731047189.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e1snrlh11qsl1s0a3piduknjan/22920413950.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b2ca8a86de75f87eadd407278fc7c36e/26919517687.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed1cbb8fa---96529119550.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eb760f8a---nokajukok.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/roxirezebanu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/o6otfkjkl2cvtg9pgv60bdss6s/18202393328.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e760309f---bifiminagona.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/96274851105.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aaba8c279fa87c6a4d67386cd3226436/24761655632.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jimisotavisuriwef.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/25091901594.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/19418889813.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/60723804773.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/11376095858.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e0b53fd0---katebikefudov.pdfIn PDF document text
    • https://spacio.hk/attachment/file/33232525732.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986988026c8---22552612210.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gcsndfugi95j7j2p99pmntgat7/95618902981.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/mirisawuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=special+purpose+map+definition+geographyPDF 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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 11356 bytes
SHA-256: 43721ca4fbb3d0889dad8e5d42f9f0f060e3fbf23e37f706549ba91e629706ec
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 17400 bytes
SHA-256: 771069e9c24de95838791a0c3ff76726a5f229df4c734ba0c81ea9fc0c625657
font_02_sfnt_off00013ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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