Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf24cf8b7fa2054…

MALICIOUS

PDF

73.8 KB Created: 2021-08-10 05:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b6a3ffe0233608a9785805f303fec56 SHA-1: 1317d27399dab2103d6ef799e850646de6cf2569 SHA-256: ecf24cf8b7fa2054dc6d6b41b1db4674e275494d6b6eb557af90548fa2c0f858
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 WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7608ff9c5cce0614da78fe095c338ccc/43742129516.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31a55b57---19693056122.pdfIn PDF document text
    • https://scriptdd.com/_file/file/36169077052.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610450d5a2921---80767758217.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/22096167814.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/53341ca27b8aebe00422b3565cbb4aef/43632356866.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/34633377780.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/mudibosu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/351a581d2a5b0414a29dc5c8a0c93740/53618020542.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97569b55b1---59427636902.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/vofapirizawamotin.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f29cea9---24691003173.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/65292731960.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095973ddcfe3---digofubibosa.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/41983149692.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/abadh5vdkciseinqlvijq72nod/4540845148.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ae2159a2---gaziku.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/75849155857.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f06484ddfb---musolojugotesixepulesi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c415c85c3---riteluxajakimodem.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/jexogevatidijexiwedu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/xepadaladezibirolinalobux.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/74664588405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=integrated+chinese+-+textbook+%28simplified%29+%28v1%29PDF 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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 15992 bytes
SHA-256: 559ac40601c533829b55ff5174a492db14abc772b48c2ce6b1a0c93310017bff
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11660 bytes
SHA-256: 7878e8a2014afbda68919ec2dfd3e16b964434d1f344897d88f5c2d1ac3fafe2