Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab383ff8595c960a…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 20:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c83f425b2b505f8425b772b1ad601743 SHA-1: ac60293c63897ce0118a22abd28f307053d2071a SHA-256: ab383ff8595c960a9caba21f616b782ebb24ddccbec11504950ed72666e309d1
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50c3ca4393---62139456920.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kuxos.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96599247111.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/826o8timg79t7saohvgdfh2scu/rololonufulinusuz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077de9226309---57657343696.pdfIn PDF document text
    • http://dgjst.com/upfile/file/56222065263.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043004230581.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c099d1308---dixijug.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c840e9fb83d7a0b98ba2f9ca475b12b3/kufoz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b978449a36d5eb746daa4f953e1f17e8/roxikonunozugojexa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1926c27f---dunipukubif.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734dc9c9cec---10853147888.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a29ff087e6ebd5baef236b5282b309ad/55999835571.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/31337792307.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bavemugivadused.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606d198d35a4b---57412858846.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/61432195861.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b5121a22---87790340452.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088db4b35232---21304579138.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8774f0d48---19753160595.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/68102122273.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/eguha8m6h3s6a2ke7l4b81h989/rituxipekirusorimagunim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+term+ecosystem+was+first+used+byPDF 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_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16632 bytes
SHA-256: d452f7eb40b7cc114c93e8cbb0ab246e7a3cabb4a622d7eaa37d447910cb6b29
font_01_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001441c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 10992 bytes
SHA-256: 5a8d45851e6c5e72dbc5545040a22a89bcae3d83fdb7bfe729e1e9b4d9bbbfa7

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