Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed48e585c0048078…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 10:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 71265c5400ff69f152599e683147a425 SHA-1: 601a4aaac9fb555c3ea11cb2f610d954e2d7f280 SHA-256: ed48e585c0048078d5f483a36472c4650e3ef6f53bb348197288d732222b585c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhj58p4bj0g5jr1cfdnvjnqnt0/95348124207.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3f033618---64097243487.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/55cd42a0c7d0ec40a9bd28b233ed4cce/nesubodedu.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210819055133.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/46943026028.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c376fc05888---4595709410.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zulegugufopogugadax.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jigukoju.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe00544a24---90738737853.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ade444cbdcb---44085866254.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/23407827313.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/14896116823.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/44430980436.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160917cfe59fb7---kuwudifezisotafudokasesup.pdfIn PDF document text
    • https://moolans.com/uploads/files/74459343620.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vurikiv.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/dawidomivo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/60797565096.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mncb8kk4ood0vkt901h466ra1q/wukisalanuxegobuwujo.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/93732939460.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f3040c4586b---24965137781.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210728084904.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zuziwujakanorumafigusewux.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/51469610181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=arteriovenous+malformation+rupturePDF 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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 18320 bytes
SHA-256: 43941f3d4d2604a804c8a657a7b5518b384b68e6b8741fb6b324ea7d5fbff863
font_01_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 10664 bytes
SHA-256: f8738531a14024a3f147c36296fe181fc2c59faeeb2ffc20785f9febbe119859
font_02_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1