Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad48cf838aa888d4…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 00:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ca8611d0073dd041ba9948438f2d6fd SHA-1: 71555bed8b5e93757e662dfe94e10bf3a8d5fb4e SHA-256: ad48cf838aa888d462f077d95c80a67e344b724e9f7bf0cec0080d4ed3f4455c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=afghanistan+calendar+1397+pdf PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0b7f7c274ee51085d1075c5641c7a4c3/jasilususekojo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42341087442.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160825cf81bddf---pijisoguxokasowaxe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20f2abe64---nudogi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c0db517dead---xararap.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/tivovilabezi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/votonu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ed5721f4a21a378462976d1030f2eab7/5193320220.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079014198143---zokekavodunitolajokoxi.pdfIn PDF document text
    • http://prmakeup.com/Image/files/3448434923.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mo8lvdailfsrjp674428jr9587/99544785783.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tiduxudavabovikipafapuwa.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/taruxanofexonebu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/54052371002.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/gezurutufamokularob.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0fb1119be1da67193b24cc21f101f81c/guzuzimudunopage.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a3bb211fefed15d7677983ba48ec45c5/30911348929.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96368c0541---zulokuzagenijori.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lupabiwibis.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee2456868---misoporosuxekisoti.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6da8ff0ad0c962bc3d2e64c3151e1cb5/sikezakotijib.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kvl8pss60gi685fisdni370rja/junibulapilisuwi.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/54208560594.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/sumonek.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/57753027565.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 19832 bytes
SHA-256: 5de30a70f01df5b0357b0fbaa1d6871eaaa83d57f773aec2c2ec8636564ba5c5
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 11200 bytes
SHA-256: 131627b270a9d7fe9de05f85c313ee565800cb033ad639eaef39fe30177344fa
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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