Malicious PDF — malware analysis report

Static analysis result for SHA-256 1539fa22739e47ef…

MALICIOUS

PDF

76.6 KB Created: 2021-07-01 14:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a491f7b6e312c7b922dd30ff7b54676a SHA-1: 6e46d316224be3bb85bced4a503a1f0819664643 SHA-256: 1539fa22739e47eff85c28b0c29ba4af3d641716e352d0b73e239a783f1eb130
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://agentcctv.com/userfiles/file/22719686017.pdf In PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2e0e61e9373598a6365dba468c96ab62/2406281817.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bdfba6d0---60447859806.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/67311296465.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lejodid.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/27376814331.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/71620795957.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ffc64559bfc8fc5a96155833a02cbc65/19463778431.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/30695ecded45052cc3213403d32c8ed3/84502005538.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1cf7a5473f152c8580508bc5de10973b/ginureg.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/828ce34c553a0422bd9b867cc95b8ed2/kumizur.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453b34e421---79812916321.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb649abaa4---36572126640.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3a5e5f4cc77f6ba51d0b9328165208ae/togipavew.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/13170921656.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/96804479055.pdfIn PDF document text
    • https://ebooksweb.net/files/file/74218440295.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/bomevomawovusew.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/10647363152.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/78513133090.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/24677275116.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa68cd9a2---93206897415.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/655a7e305b7c58614cddf1d84f23ecb5/19504753017.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gonipimamupadakowoti.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80b0e190c---54610093523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=teaspoon+to+cup+conversionPDF 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_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 16344 bytes
SHA-256: 6329b4b9ca3d6158d11b205f07527e22c2faef17cf1710707d7b97a3d6bb1b3b
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10448 bytes
SHA-256: cea3ae54385e3c48824cbdabf8cf8a0ad2775e44882574c159d3083fb35008ec

Open this report in the interactive analyzer, or submit your own file for analysis.