Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72e23e72be42b4e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 10:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e9741d0e765de2ad742f6466150cc53 SHA-1: cc537b8a5ecbda0af4e5ab25f85f648c9d82b0d4 SHA-256: c72e23e72be42b4e0e54f2899a8df33fa3fa71dd9755e8cd366381eb09ede10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/63100864052.pdf In PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/zujasinobonelaniruko.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/foporixuzudutone.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130677380991---nileduzozusepupedunon.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6931033319b15a8d03b0f1c30a25a036/14692425004.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/87400143877.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/51388112088.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7e20f721842e1c8c10104d555e686d77/10975824022.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/kinubejabos.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/99380645661.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/24834861646.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/lapalizameridozizejot.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b833bf8cb2d38abb19816bb67c390f55/22642065409.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/zurasupuxupotubezopufi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130667d1cdc6---jakufaribem.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/79833081657.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qqao5hr9jq3e6ps25ojp206sor/jufotijiginumekajuxuso.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/69392153621.pdfIn PDF document text
    • http://telecycling.org/files/file/44005707831.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4e1e1a77---26486335505.pdfIn PDF document text
    • http://ud2-140.com/files/81152364454.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/ladabeju.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/59294617230.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/88009316734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=imo+beta+download+2020PDF 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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 10468 bytes
SHA-256: 94e7233015653e140d6877f13e6a5d2e5f4536ef3b81a855172231415dc2f759
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 16756 bytes
SHA-256: 715a1cf8cc94c2904ba464f1b2a4f400b183fef75bdf89e710cd32d9897bd5c0
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1