Malicious PDF — malware analysis report

Static analysis result for SHA-256 b279d86fa5cfa774…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 05:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac496bab25706ef4241fbae16c2fd63a SHA-1: 04615c24732f85a2b02684d114aa41f85de053f5 SHA-256: b279d86fa5cfa774c415f8d3cf716663f0aaeea716be1510518394e73456191e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/285904efad2461f9225241866daa3142/95373367978.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12209249685.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1m5bn95ce5j7j1825s1bkndg3p/dixapobikanilike.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983321160f5---56286962327.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe37784e2---verekiwatufadofukage.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5akmmbarb9mn020vp2bfv30jdo/69341068739.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a3036565b46566e10eb8d8d76de0d52c/pelubebiwokobokudibusuju.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/35274861334.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/99179191063.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fcaa402ceb3bbeef563e5fd88b26cbfc/56566104901.pdfIn PDF document text
    • https://hgb.se/filer/file/selimagozepifezewelu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b494125e77b---46277618481.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/650251861b2a8a48729da14f055ef608/dafizosi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c68fae117---gujabolaxarofeso.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/ritaxipubalekovuto.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077c97c08e2f---57374226081.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lonegoxatugazem.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/i5nleipk1a25ic2v05fm01uo6p/47811815872.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/87994702480.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6bad40d3---49652856537.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/53829692226.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072502d48a0c---36975829935.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/2226802141.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccaabef7c---mebapapemikareladupujagug.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/vijebegumaxavexuzibaw.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n021m9i3shhh7u8818rscsa36e/delagomaxexojukumukokus.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dabixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+know+when+a+carrot+is+ready+to+pickPDF 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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 10948 bytes
SHA-256: 38da8f6a8d133d0e11b0fa19f85042bc3df7a2392f3d84aec8ead783d4533891
font_02_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 16932 bytes
SHA-256: 62cbf81d3d1a1c595896d2bc51ee9f65a3cf6192937996c0217d8544a77f8815