Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c3f540cede02f1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 10:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb0a1963ff1e515bdc445c306fc2ed0d SHA-1: 4d3b7027f2a8083f520eed2d63d845505dd95a1d SHA-256: 18c3f540cede02f14fe043fc8a062d3c3f659aaec844cba25903a61413d6861e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple external URLs, several of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://semangkamerah.com/contents/files/molavanufudosuzekaze.pdf In PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/8926953397.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19504612559.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7bc0fdf508a5afc43c3b8dd130a072bf/fojimizos.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a33c705---tiluwofozubitovotugata.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689607df5---56699536019.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/61374372267.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/fepazefim.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5a219a7834bb39a4755674b827b35d3a/83172605631.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/dimozusewapalewasexoru.pdfIn PDF document text
    • https://mmtours.si/uploads/90579392276.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/86302326705.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/wilejakuto.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/9864768521.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613773fb8d525---82510308183.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/manajupuniruratug.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905033506.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/pemogana.pdfIn PDF document text
    • http://sinoorchids.com/image/file/63841530791.pdfIn PDF document text
    • http://drtamerturan.com/file/63074607717.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/xipolu.pdfIn PDF document text
    • http://yoron.net/up/files/46663243396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+smart+lockPDF 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_off0000c09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09A 17084 bytes
SHA-256: 8fb387d87809d50f7989c132d2327cd9954b98ee1a6ca5866f5813b8ecf419c2
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10472 bytes
SHA-256: a2d9f20f0033665437b14977b7161cb6ffedd0465cc089256fe514776d02e620

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