Malicious PDF — malware analysis report

Static analysis result for SHA-256 990277af15dfa08d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 01:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d4b03e78da5f40a53730508e8c08b2d SHA-1: ce5ad3e10cd9952afc7a849ee3b216f9d9f00256 SHA-256: 990277af15dfa08dec23d646ea313d1ba8076e264ee94b4fcafcee0829042894
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious workflow. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=save+each+worksheet+as+a+separate+pdf+vba PDF link annotation
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/jigis.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba0c8824---gipufapiwofegexesaruv.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/30805237649.pdfIn PDF document text
    • https://norservis.info/files/files/25827272276.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322da3dec5d---fefozufanuwogamewedodub.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/nitotapuvat.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344f448e4f9---gasetazijun.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/vuxazagipokis.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/leporulo.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tikijozidodeje.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/10155518462.pdfIn PDF document text
    • http://zaiger.ru/img/file/67011930190.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/wikaxat.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/11452002890.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pitawi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/tomipifidusipotutafe.pdfIn PDF document text
    • http://specialcats.nl/media/files/99259186412.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/wunava.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/65378701603.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071312333974.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 18016 bytes
SHA-256: 4c15b2d6422741c7d747dd3d9c13e02b8119537a0f736cdde348dd11e84c34ef
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 10936 bytes
SHA-256: 97ef7c4cbf51dc787fd1bf6fe948b81d6e1bcf7c9c89dceb4e084a90a73928a7

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