Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c53968df5b8e58…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 14:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fff1347b2e743e19c6f8c48e2b65e08 SHA-1: 4c4fdd02cb837401911e1f1b078f32bad337aa6c SHA-256: 87c53968df5b8e58502e7a84dae4f2980d5946e582043fe59536b234bb4f71dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://longhoang.vn/upload/files/83768958731.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nbk2hjme1glhl0qlpcje441pp2/71035937344.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rotefujotebilolukomerab.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/butonepulekikel.pdfIn PDF document text
    • https://makenie.com/upload/files/25103825982.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/sazipazolalulodewaxalu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341bb11c40d---43262153076.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/61671787182.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/vufubepele.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/73403939220.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139278c38d32---kozazavisirotumenegubasa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bfbcd91---lozuzopesufobebede.pdfIn PDF document text
    • http://schokofontaenen.de/idata/defiwuzafuzajukopa.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210902_232434.pdfIn PDF document text
    • http://chemicalengineers.ie/images/zitubimufona.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/41988725724.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/70301088651.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/98061898359.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355673744b9---xiduxadolisob.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/65516100224.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/wililuxevumazemudewima.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/gemujexezamepawemiwezos.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/11792766415.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/39166115169.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/80504075565.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/japerosogiwasesati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=deezer+cracked+apk+2021PDF 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_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 19836 bytes
SHA-256: 6a2a74d7a061956a447dbfc8607920fd328ff37d33a3fe1f20668e71ef00375c
font_01_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 10328 bytes
SHA-256: 080f9901f1012dcd823a2aa9f6e8efe62936257ca304eb97fc903c59591a5a3a
font_02_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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