Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd47ae8a28b9eea…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 20:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8b1c2ce9fbd83d2007a71b816ea38c1 SHA-1: 8033a1c441fe3953ad973fac6d4ec3f99f5031b1 SHA-256: 6dd47ae8a28b9eea2621921fd482b5fca972ffcd237cb73f02ace1a0e431812d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable domains. The heuristic firings indicate a link farm designed to direct users to potentially malicious content, disguised with lures like 'minecraft java edition free on android'. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hoangnamjsc.com/upload/files/luzuvorad.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vpcs2onv8sbap3ocsho12klb33/8160561822.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/33199049057.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/38272198011.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31435541681.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347df894aba---xuluzuri.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/51495395681.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210915_F42974BB25274A64.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff488d7f0---kibunibuluwekiwob.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/67433748348.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/14116085421.pdfIn PDF document text
    • http://wsm.hk/images/files/21013917746.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c468b54fe---subik.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1297221627612f53824e5e5.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/54100113274.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jawive.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jegez.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-3/20210903000134197708.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mokurolamo.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905184708.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/4013035252.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/revafobefen.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/kurarol.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/83030030261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+java+edition+free+on+androidPDF 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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 18844 bytes
SHA-256: 4494c7c56aa8ee2d3076bdbc4e3772ecc191d3e9ca5a4d03d23cb32948f16ee0
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 10444 bytes
SHA-256: 1d77cc7d8d46c918c610b5012ec8f8956ee26c9289808ba7af190d3cd609e4bc

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