Malicious PDF — malware analysis report

Static analysis result for SHA-256 253d30174a1c48e3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 15:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6ea8a419943f3441e8e4f85d0296ad3f SHA-1: 4bfb225cc2834d3da62428e6c270369db0f36df9 SHA-256: 253d30174a1c48e39cf6a968a3099a62e9ab028fcf0e59d0a84e4704f6078700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it is designed to redirect users to malicious content hosted on other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=harry+potter+books+epub+download PDF link annotation
    • https://dennismaloney.ca/upload/editor/file/75387286947.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/2991476377.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090714483079624.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/60768636450.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zakofeguxutezitumoxojoge.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/77715764586.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xixoxekojaxarogapakalosu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/dajudimotupuv.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/72278677286.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/wejovebuvovimazesodunezeb.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010310237761.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/gaxofekidetonamebuwavudu.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/6252015848.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kugitepixab.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/97092688946.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/aac1f6154b2513c34b94590e58a22e75/97734269990.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300ffa8406b---tokivewaledosoj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1cea27b0---tolewuxepukumaresulepoz.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/lesutafirefojeruxe.pdfIn PDF document text
    • http://checopharma.com/upload/files/wuzopuzokotomuvemibes.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/44387147574.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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10816 bytes
SHA-256: 2e681813a5b28c4dcc6bdf7d718f230a3d5b5d783a1db5151da7a35bd0a4b08b
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 16988 bytes
SHA-256: 5abea53dcab693211cb1b2c2913dbcdd4474d4ed1d9600c8c21b3f901ba5326b
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1