Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e7568561dd73d7…

MALICIOUS

PDF

146.3 KB Created: 2021-08-09 15:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb81c8230601d4cc58a87439158b64aa SHA-1: 09a3f75c60b09edb0886f1af1842a65a83f42964 SHA-256: 99e7568561dd73d7cdff4035a0080ad7583453b80cc7a6e004efae64f249fcbb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/71888675272.pdf In PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mitomaxovurigilupujamido.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/53dcce757194112244f9ebabc0fa9672/87613313669.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/9002752495.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d049318d---82310029046.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/13646816356.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/30157638.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608961096449f---levoravo.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/50760239201.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jadafefefebegum.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/90308770999.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35af6f01c---guxugezadilivon.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c4bcad692beacd6264eca04b289eff9b/mirakefasuf.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0lt4r1u6dh15p0qvmi11isnfnc/xejokikide.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/zejobedudoxosibizane.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d0ebeda---videfalesebejugimox.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511151257.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xanixefex.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/40dvl3emhnq8otnhm7pe6pdl7o/21712193655.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///fubuw.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0c8c0364cdb816b2748b3ac3d31d5d99/suwokuviwozijepoto.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/256121946.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210722081659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+they+them+pronounsPDF 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_off0001d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF94 10508 bytes
SHA-256: 7a41f6cfd9027ee192e4d6056ee4658eb670f40d079300379ba84a164f6a08cb
font_02_sfnt_off0002075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2075C 19420 bytes
SHA-256: 6e3877fab0e3eade4a08264528581076530f9427606ee211ff2c53c962d76a8b

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