Malicious PDF — malware analysis report

Static analysis result for SHA-256 7632ab4d08e55b13…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 17:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ba562dc3459ad9c5b71e637ade4d882 SHA-1: b81f913bf82d91311683362b452e8cab25a1895a SHA-256: 7632ab4d08e55b138ea88056cbea925da530c855d2ae6250c807652fd77aa40f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for 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 destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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 http://xn--aknmedical-yub.com/uploads/file/32469114395.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/35523294053.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/pojorajozosofutabop.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/kularowovowoterexemuvivid.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/88202973122.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/07a9ee863ae121cebd99df615a57245d/77363390817.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/sozigunorumibe.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/77983136804.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6a76b8e1---41195223369.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/96e3a2f014d2684075cde9493fd13f91/52671825215.pdfIn PDF document text
    • https://cape-electronics.com/media/file/gifanazewuligibukuveza.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57cff1b96---77199615103.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611e54e95---89049406141.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/62669931150.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/powipevulawadodojinova.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bbbf49652---92166591068.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7926ffa1---zuxozusagewolesupekobapog.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53188526758.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/gopoponedamapejabuf.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/31840259933.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080712222076.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tl1k7fe6og542652t9ba359s72/46508631557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=air+and+gas+compressors+nptel+pdfPDF 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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 10944 bytes
SHA-256: 89cf68eb7e412366f59e1d175b3caf50f227e0a3b6902a852d4d70f776ff9984
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 15404 bytes
SHA-256: 4eeda71fbba25584ab364c5af3918c21f510604e3af67bf5ecf84dae5ac8ba8d
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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