Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f8abba08c441ba…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 04:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c87d81cd994df900a279dfa55e3ef8eb SHA-1: f51b032b096feba0d833246306b8bfdd91041c57 SHA-256: 63f8abba08c441ba53dd836de73412879e7a4c295e2352e9ed0e823de51bdd29
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update, a common tactic for malware delivery or credential harvesting. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest malicious intent, likely involving the download and execution of a secondary payload or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://inwebjor.ru/uplcv?utm_term=how+to+translate+arabic+pdf+into+english PDF link annotation
    • http://bigband-ulm.de/userfiles/files/sudonajutipadal.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cd1f1bb2bf2271a14e4a41ad5cc61772/gawojofalefijunam.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e9ac1d3a---95688112518.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68244381664.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/mazatokofijo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276e09c039---26789194665.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72929c278c---sigefozukef.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/levijiwidexawata.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/95872181775.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/513a1b78ea5fb05ffacaf588096d135c/xubala.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbc55c71e---konoxozu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5825aca06bd7928558738c4ae75f2e50/sovix.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/uih1qifc4fkidov9a4kbrp4n5e/wivopaledesegezisoravaf.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/nosupexorebajiwudob.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985360288ec---15203866100.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/vovizedosexuduvebedi.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/51305329902.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098eae7ba85b---sukowujaruvuwi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5dl2gsss52i96pt17j4etnooul/gogirof.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/ruwejozevasufabifan.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154357276942.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/45662177232.pdfIn PDF document text
    • http://scro.ru/pic/file/16499755093.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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 11116 bytes
SHA-256: aa041c3686f11dd746cfea3b862166672f29ac6f331c8381451b3253a53223f0
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 20100 bytes
SHA-256: 5f0c7c26512e8fc590e812bb15e11055b3ce1eda16e6e35d9810a4630ae63376

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