Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed396edffd325a77…

MALICIOUS

PDF

86.9 KB Created: 2021-08-09 12:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6eb9f53cf72aaf030ab203b460961a88 SHA-1: d6b26b18d0e70d3c520f66c8406faa560a7233cb SHA-256: ed396edffd325a7729eb1c92ff9c236e84050d94c4ac48d238aa86833e3f78ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple links to potentially compromised websites, suggesting an attempt to trick the user into downloading a malicious file. The 'ClickFix' heuristic indicates social engineering tactics, including instructions to run commands directly, which is a common method for bypassing security measures. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apple888.vn/luutru/files/foxupiderowukazokij.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a82e570cd4fa1aedbf2be6609e837dbc/zufobesijazofakonak.pdfIn PDF document text
    • http://imaginove.eu/data/Files/11355615403.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d65ae1f41---jipewojaseni.pdfIn PDF document text
    • https://airbays.com/userfiles/file/mewagoxepirivebutoduxo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/f1ajgncbb2ge4agpspm64baepc/rupezetizasejurixidem.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/dimuruwunosadarogaxuviz.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jofuva.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4682c1b0---vuwexuninozikaseperamalov.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/24381984261.pdfIn PDF document text
    • http://msiutilities.biz/documents/36302859024.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334f8e45ac---14806561610.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/77043482665.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/pamudorejewomibigumuwolo.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/nekogojazilimuwizezigogu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/donijitubemefutub.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/ridikasafisomamesawome.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/depigiki.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a83791917f9a62621fafbcdec48441e2/dadotalilefoxofowijale.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/28264785717.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2dd0851ac---70385670838.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/kujapelad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=windows+xp+shutdown+sound+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 17692 bytes
SHA-256: 461d93792c72953ea49443cf2b4508b90d14a900bf1bb71c199501b439d557bc
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 10876 bytes
SHA-256: f95bffa36ec4e6128a1621af99aceb23dc5706bb82b61e744f417bc20b6da506

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