Malicious PDF — malware analysis report

Static analysis result for SHA-256 906b0c51c8445908…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a73057dfff61ceaadc24b2efc22e52c SHA-1: 48565b1a743f57b7336baac02313c99fb8dfdba5 SHA-256: 906b0c51c8445908047ed3be7d81e720d5ec4e16f02c6a68845a6b119ac55311
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. 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 0.9988

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://crysiq.ru/uplcv?utm_term=sonata+no+14+moonlight+3rd+movement+pdf PDF link annotation
    • http://mrs724.ir/basefile/drtiketcom/files/33765303915.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tavonipamiribov.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/20734720163.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/64495318748.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160746373b1916---49691448459.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/97980836173.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/pazovajo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9dbb25b---zebupopudafizipup.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/57480229855.pdfIn PDF document text
    • http://fitviewer.biz/files/file/dusom.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0568c9e0---74219956423.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4717c4050---11103226629.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1be8a1443---45620587258.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/mokibiso.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/68339507057.pdfIn PDF document text
    • http://wjcopy.com/upload/files/vogaxoxilel.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/99720074699.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0203b231b915b9eb252799ee8ad65076/viruratawujobobititirur.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa5fb15c8---wujunudowenofefovaw.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/vapejepuluxa.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 18788 bytes
SHA-256: d635365733fd91e3625094bf7e84ed596c730c87c045a4ea65b68675f081b422
font_01_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 11220 bytes
SHA-256: f7353a03bccfb7d1c567a775fd8819e161906e87b4cd23627dbfc934c648d070
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1