Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fdf80d1cd1ca70…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 468b7d70586af3e09c98005bc7373592 SHA-1: 0d44094272f6562d2f7a0d41df7a9a62be562e9b SHA-256: 02fdf80d1cd1ca70c69d7db1bc0258c7f92a70569edd530572796d5aae969dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=talking+tom+camp+mod+apk+android+1 PDF link annotation
    • http://s4l.vn/storage/ckfinder/files/93730056397.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/linifipofilu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/wifizaxaf.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/55681721976.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/13300342979.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c08062b2b9daf7bb1c2ab0c1eb20cd4d/59232831703.pdfIn PDF document text
    • http://moretonassets.net/userfiles/93584003448.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/15959745777.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fef5c209---73317353924.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/9813762026.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/25554753337.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/fjopvva81jengou0ersfkrbprl/mikimum.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/67076580205.pdfIn PDF document text
    • https://norservis.com/files/files/34894366930.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b43aeaa6f97eb84f943715edef16455f/lagutevimalakumisosek.pdfIn PDF document text
    • https://polaria.cz/images/file/zutupofuzawasurebiloku.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbbfb5401---venarosozijodetivepipufus.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9ed711c35c6535d4a948b777f8341b3e/7309245441.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/mefex.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/38226792860.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_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 18188 bytes
SHA-256: 376056785e4051789404a167a281fc6df274103a9e58ac5a02ed9266e535a906
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10664 bytes
SHA-256: 7bb2e62b54153366ff2729d7a99e9ea52c25554a129efd590e34ec1c36bd0140