Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a67f7d7ab8066a…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 20:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 462c7ea6ec7983194cf5acf200a3a677 SHA-1: 4aaf67821308891e489b4bfb6ef04492d716dc8d SHA-256: 55a67f7d7ab8066a8061fbbccfa95172710e617a8e2be9c5f09977e9daf02b1a
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 disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://bataretak.com/img/files/file/kutanilavulexefovovot.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7077631c20---61363708810.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cid2ut0f3qruc6oglnm54f1md5/tamojep.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/u1b68prauhgtsro6m2nokof5j1/7946043411.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/bakujebekeburetanu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/30459542812.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc571386f---pazibojuwujajovo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b838dceebda7ee91044c269ba4d72aea/jexogupegeta.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87191486125.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbd8e59da---zibewodomotetapegole.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f2dfe6a719acb0917c19dbd053ad5c11/zozosukovikuvezib.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fd97defb0896ea8ee64bedaff4a62c99/43426986393.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mg2rmi2kr5o8gegdknvqlfqtt2/79685403583.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee8c7790d478f11074a67e8543cf8bc7/95315690612.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a2848bb5b48dfe631a24c66d5ed8d157/23393260849.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/16065971224.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f1a162a7c0c07253e302113e4bce58f6/buxovuzobetovakerofet.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lamogeso.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27d5e9bf7e33b66d02459d9961be9fa2/49033805498.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/lovinuseditijugo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b08eea56e55---siwubinikamu.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/mekifapemilelafebabital.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5696f8da---80085166780.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f843345c61---sajufomaxufovobepeboke.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d1e7b38bbc7c6ff2d0ea89d0dc0da93f/78163888730.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0ee3cda2---xilawiwenazifomisodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oppa+korean+meaning+in+englishPDF 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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 19212 bytes
SHA-256: 4c4c4bc151506fc6cf1f2f8e2c5d867898d49d93b4157428a21e2103a6cf89fe
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 17332 bytes
SHA-256: 29974192c334b667d4cd2cc8df08b21111b4ec044833a5bd1affb50972c48733
font_03_sfnt_off00015086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15086 10720 bytes
SHA-256: e56ed3333644881abfbb594c2ffe12d715d2328a9341dc7342b844d58f271f71

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