Malicious PDF — malware analysis report

Static analysis result for SHA-256 81555e06f4b13d42…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 07:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5936056daad24124a4a7c8f2bfeffa5 SHA-1: c26bf7e8c52776265d8481afa1f4c200a3bd5944 SHA-256: 81555e06f4b13d42b3d1007424b99144ba7a4f5d8064249dc5af6cd824ee6651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hkalc.com/userfiles/60545001192.pdf In PDF document text
    • http://chira-med.pl/pliki/bakunukapamividuzux.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/102730633960a6dae18d484.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/naxikazipin.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/godaboputogeret.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878660bc65b---22243373335.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611428c56507e---3557944564.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/93287669809.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9519c156---bumuzinuwemasivupafo.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/fuwavixel.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fcb21f66---11933538520.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/984f1623e95bf6488a6674c40e610d17/jopiviromenob.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae757a14e8b---58064233467.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612172291423e---rijuviviwumowalizibagap.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/22210093702.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lerolitof.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/13281321964.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/funudero.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2b7b16d173d07e2d80d32899c0b8cd6e/mozalafudijaterosibozo.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/xukamopozarewulutetubat.pdfIn PDF document text
    • https://samudra99.com/contents/files/27845621456.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704dbcbd059---dolupenijatenege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=define+implementation+pdfPDF 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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10392 bytes
SHA-256: 10db21d6366f8c733edc031c7545ea3bfe264df0164696ac54939a03f98a3f0b
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 17432 bytes
SHA-256: 4633853f4d1cd35fd3ca7aebc2b9712eb88ca253b10061c2c16ab82b681183ee
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.