Malicious PDF — malware analysis report

Static analysis result for SHA-256 7803716a829700ae…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 01:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac23f80074c2bc02f66bec3606780f41 SHA-1: 68ee6727ac29b0152b9c450c192a2acc57ac187e SHA-256: 7803716a829700aeafe436fd17895f15435228e0758e7c0448c26ad8def0fbc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. One URL, 'https://crysiq.ru/uplcv?utm_term=lucky+patcher+free+download+app', explicitly mentions a software download, indicating a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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=lucky+patcher+free+download+app PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fab0a568---gojer.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/begijuvulebir.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/55637136838.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/98995292730.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/86056720396.pdfIn PDF document text
    • http://cmtsport.com/pliki/nubozomedigitev.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614620e14e2f3---83104375898.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/96109037525.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/ratote.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/gozebejodotudubafakures.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/fb822d5f955823d0e44e0039d1ad7024/30028460789.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/77278526345.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nepidumed.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7cb8e072f---jidobozevililosexapabeza.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/godorazujomamejifuxodebo.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/sowitekelakupatesopaveso.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/komonusef.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f22217488a---96808746849.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/malefamuxeruda.pdfIn PDF document text
    • https://bolahijau.com/contents/files/39834712737.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xaxiridanixaxifiximabege.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614973048405e---61131244925.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/laxemabajedita.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/91964206505.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 15176 bytes
SHA-256: 9339c1defaa67ef34a3537132f6da5360675b068f2c62fcd0adff8ecc1ebac7f
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10804 bytes
SHA-256: a50c47fb96b0bbaad0f21b9836850eb50980d3e3abd4742f7fb37d28f88422ca

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