Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab8f0412ccfc21c…

MALICIOUS

PDF

92.7 KB Created: 2021-08-07 13:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95df0de059846586492cac02159b13e7 SHA-1: 3e01f1332be9a17bbe9ec7037ce44a8182ffdee7 SHA-256: 8ab8f0412ccfc21c387a18d6132fbf8e447f0615573c3bd34f0d091244716bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=camote+de+lipana+en+ingles PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5d7e0ddf---98387011481.pdfIn PDF document text
    • http://iwort.de/userfiles/file/71090402144.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xigoxumapebolupebezapowo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4bc4cd42---55576156321.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87c1983b1---20254540932.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/kifof.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae3e6b8c4---31268520047.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0881b059---6325712832.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/42181227475.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/62507696060.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/84844188025.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/85493355164.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/24179491394.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082441b4143a---pazilomubasarovazuf.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4491224---62265405391.pdfIn PDF document text
    • http://garderoba.sk/images/_file/20303193650.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081935aa573d---zaloxasi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/rafelumepon.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bhehrj6qsqdvegmm2njs299k66/nijulebigome.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bf3383b7f1080d17e33562c01b663434/lubaduz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fee6ace4---76512001333.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160991b4da58f6---komasagixonaxapanu.pdfIn PDF document text
    • https://doganagolosa.it/file/94426660739.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 18904 bytes
SHA-256: 295a2544dd18b64ce5b6449460db1e80a1e5dc610b1e91ab252188b09eb8a483
font_01_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 10664 bytes
SHA-256: 9ba180ab99480e55a9171de9d5925e299907a7131e7e087771f3bb376ef7b669
font_02_sfnt_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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