Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58d6e6c13dd39d0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 10:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f30181493e56d93bd6cdfb8e955a2c10 SHA-1: 10c32d6c5d1601a70ccd79d32588e4fee82d2ec8 SHA-256: b58d6e6c13dd39d0b918795fbf4ef38800f59241423c9b178b4c68e95c514b5c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chiari-web.com/ckfinder/optimist/files/wojadib.pdf In PDF document text
    • https://biothiennam.com/media/ftp/file/zurebenuwugam.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/dorusexajazafeguxinogogub.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf68612a6---pexefilugomuxamifidogoj.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/55760211951.pdfIn PDF document text
    • http://asid.rw/userfiles/file/fokewozuwilumede.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c88519d3---82625030753.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/gegerujas.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/92289835855.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xejabuf.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/65877113891.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/77661846475.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35749039842.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/33737049739.pdfIn PDF document text
    • https://atl-50.com/files/file/20627988892.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pugare.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wudimobesefunam.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091632b33f23---84815782040.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021082207435117.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082688a646ff---muvaselisamepubeviriweja.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c397866825b---71741783422.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/76891226171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chief+of+policePDF link annotation
    • 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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16628 bytes
SHA-256: 411f97c63252b90413f3100c9cf995a3b7fe078f882a127690cae76e120507ba
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 9976 bytes
SHA-256: b2131b88912b5a1f5c7dd5c5df4f419b1f3cb5f4ac39da89dee79dd6790320b2
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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