Malicious PDF — malware analysis report

Static analysis result for SHA-256 269285b50e3fc91b…

MALICIOUS

PDF

96.2 KB Created: 2021-07-08 07:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b4c58b6163c81962f6e81ea5cf76384 SHA-1: 95cd376dfb66783660563f27743a420207ae60ed SHA-256: 269285b50e3fc91bb9f51576edf36afc2e5cd9335da1c943748f23f6dd1d95a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other PDF files, indicating a likely attempt to manipulate search engine rankings or distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and an ML classifier also flagged it as malicious. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/39e7bc9425b11ad9fb2e61eb4586e973/xidekinosenopidokodojeji.pdf In PDF document text
    • http://arch-teh.com/pic/userfile/336767843.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857857d0057---vexigegosumanalidipikego.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e11ef1a80---wikasokiwulebapo.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedasuroxekomakunoraf.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xafas.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/17626696410.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s21jsmmu5rjr0kqldbi5d5bh5l/kezenedabaxekejomonado.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/30475266738.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/5855200001.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/07be7d3cdbc1fc09e8ef669c0b82e5b5/ravukakupiz.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nojupatisal.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/zizok.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5fe8c2a4---gulifuvexufuxij.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/g2rsqpm56m6lt0otki88mbrbgr/sakozafan.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/988e2002117a52eb24319788054fdb61/93216245692.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6579381c66e5c2797ebdc51a08c43f0e/65698114259.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/diridojip.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/931bc87eb8688f432617790bc06b72c8/56486369446.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd341d6f27---67586887001.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4mvfcu6o1dmsgjngida2rud5j/53405642918.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/55597643464.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pajeximasonoxadufotixonex.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/54991945634.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/demul3qm626h6ssl0tgmro00t2/21667453128.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160777fed37c63---wizigoletepeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=thought+provoking+statementsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10876 bytes
SHA-256: 630baec802368a3711988be71582ba3b44fbd7e1c76f29e2e399b35adfe25e5e
font_01_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 16900 bytes
SHA-256: 0010401cdb5e231a09c577f0a3736359026332768d326562d4b7cda1491bc987
font_03_sfnt_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae