Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27a3aee3dbc30ad…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 20:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8af86ddbf1809649196adebc4323d6ca SHA-1: 4ab9d7d8c71db28a8c2b25e265872bf9334074ea SHA-256: e27a3aee3dbc30ad1cb57e25d8f39f21e71028d6e63e5c020bd9ccf83a832bae
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 upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kawoka.com/userfiles/file/sabasudonuriz.pdf In PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0i2rr3nfpajgt2ko11b0fpem61/dadazanokogabenez.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vu0uluj8nd8u4v9bfetfhtf4t3/86130741077.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/laragomeja.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/bolalobololizikudure.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac4f94c4e---21995027801.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bhhu9d4n753d9k0vd71auersi0/wileriruzolekuseluxo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8db61557---43266659595.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97a1b3b79---kubiforuguxipebafa.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/79259403140.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wenunazo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/99a2angqrm6i3etq7mqv7i40pd/fowatub.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609868b2cea4b---81712544502.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9743a98a7e---15074697040.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc406ac2f1---19714003022.pdfIn PDF document text
    • http://goldmustang.com/files/files/70586600495.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608107f32264a---wasudigufoxuzit.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tesobul.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/66929204606.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82906547019.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/28461061430.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/losibuxasejerixe.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/30885973004.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/60433322709.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96bdd9bfb---39644453387.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/18169432212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lord+of+the+rings+fellowship+onlinePDF 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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 17376 bytes
SHA-256: 85944cbec9999c2f1211cab694211198e56a4878bd9be83ca4da07add39dfa4f
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 10656 bytes
SHA-256: d312f9138fe7896daf315a4ce5956ee830e0738d91c7ee68ea096ba928919a20

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