Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a93b99ba5764689…

MALICIOUS

PDF

78.6 KB Created: 2021-08-04 06:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a2bb177090b042bb61792ad7494e6fde SHA-1: 090dd8d80b7d94bc224112036785972babbeae56 SHA-256: 7a93b99ba576468996b022b8680aa188977764fc4a2dcf18b529c9641f3ac637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc6bdca92---zajigubemajos.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6eff8a285d139190a4657d12de1c8d8b/lobesadamanari.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/76968877755.pdfIn PDF document text
    • http://armanetti.com/images/32667704498.pdfIn PDF document text
    • http://sns.hu/_user/file/18746869196.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/popibaju.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/5582205116.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ba700842b5ff3fd6961450a13465d3b5/58287484945.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/2450312723.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/11330746711.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267fd559cd---pebidewu.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/bulufewelaxefosasi.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/a82bbaa7ba12cfc8bec4e47ed93c8c8a/41680349401.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0c0aa6ee40b91a0f24023b236ccac852/keripopu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/51318291382.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/13114001256.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3be81c159c262126c4e587a072a4e3e/fovakapiwow.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gg8t95scrqaif4rje0vn8uvnnt/12806194664.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/555f58c095c1eb376082ff2fb29bfa79/33501925356.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/guzedarox.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ar51e85atuuo3ufl9uv9cq0ts9/19426992839.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/melabomilewawakenazuva.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b526cb21e8b459fbfa13d899019213f5/dokitixuweja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=american+english+file+3+student+book+answer+key+pdfPDF 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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 11752 bytes
SHA-256: 4a764ccf392d09cf96ea68a028c61ebb230789a4f11d1648d9ff297ed4ab4adc
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 17572 bytes
SHA-256: 86a75c3902be5b3d737ccd1c9163cb1297634d46840eec9b071d41a388a67b6b