Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcd4d9f3b781da3…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 00:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d389ff687b81f0271ab378b720446cd SHA-1: 3a362f213f6d59bd98dba6cea755e05b40484f52 SHA-256: 7bcd4d9f3b781da3ff4c9faa029acc5147bdc20ab3585356e726a48c8535abab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links to potentially malicious PDFs hosted on compromised sites points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00681990b4---pijokatojawem.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a789a3b473c003ce80d628387980d7c7/53579347720.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607550a90df99---nelone.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b7f3ad3a3464d360e242358cfbe4e1f/65732495223.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/i6na3oe8lhh6537mgl8lo6ern1/41450958549.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409518f95d---sebex.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeba482699---69842241424.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/83516376582.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zuwum.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/53742037678.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160719283e9260---80209894833.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5fc74c0bfe9ff78296cfd1c5cea95460/12933274650.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/44176953845.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/sixovuwowomusa.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210621045733.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/tujapek.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/zapudofi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0gn58uqtadv05vpbiovu8rlah6/sedokotopojovuletoruwutan.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/39769292706.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609859363eb96---tugurasunokefagovig.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wuwidag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=molecular+formula+and+name+of+compoundPDF 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 10516 bytes
SHA-256: 907a20e5eed2f79fac83a9a7063248d3aad796689b1b6c4a48268164ba0a5964
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 17136 bytes
SHA-256: 4203f7e0b9dfca96726e20f6c4aaa1b79c1d3620168c132f4e9326b4db9b0708

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