Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abf2fc5612d9f44…

MALICIOUS

PDF

308.3 KB Created: 2021-07-04 08:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 36a33c40565a686abfa5e3f91ee74f38 SHA-1: 8e939a1a2d9a4dfe11c78354b53bfe3ef35ced96 SHA-256: 9abf2fc5612d9f446432578d7c574d6c2ec9e6838b112d99020be26bfc186e07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=boutique+consulting+firm PDF link annotation
    • http://ondrejkocar.cz/img/file/ripirubunojo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a672aeab02bf67846cd4c7b8bbb220e2/kawiwiletefo.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210613_2C47236DC78524BE.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/73961216948.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b8f4259eb58cff28d31a31e9361f20ca/mifidojezo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607230532431b---527078421.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c974b6bfde---31192806677.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5icr6miufu34bbkpjdtn06c9qu/84586019248.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f6215308---lodivefogujufatepu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2d1afab9526214aeab55ed636bca1aa3/75032826874.pdfIn PDF document text
    • https://ka-base.no/images_content/file/setujidenat.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-16/20210516233918471331.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wovepi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/pifiga.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t4qg9s8125hr4v58iate4lv557/71348352240.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160932915b5c70---bakexijupawef.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/pogixapevuxeganuduna.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/22981169994.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1084155235---medolazolufufukagiguba.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/bijadebave.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/03c232e21b8f722d9bab64f708fa0784/kenemofuxivuvopifunuv.pdfIn PDF document text
    • 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_off00044383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44383 20692 bytes
SHA-256: e5c7e662f096afe9d983a77d2eda625d106c687afe73e5174c4721fb09b07a6f
font_01_sfnt_off00047794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47794 10816 bytes
SHA-256: cad8ddc4cbe3864671c05c1396520d97b419b3a2db5545257de9c59638fcb238
font_02_sfnt_off0004903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4903B 16928 bytes
SHA-256: 966ae6346fd92d8c2e09c65889b428b453e025ffb96c28656e579c3b3589c1fd
font_03_sfnt_off0004a8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1