Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ccad90b87f6d70…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d357b0730732588dba559623bcb1582e SHA-1: 0fdf073e250532dcc2311f262d26f54d684ca95a SHA-256: 75ccad90b87f6d7073a11893505af8d146fbe358ffc07e1b81e2dbb954e93891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised WordPress sites and disposable hosting domains. These links appear to be part of a link farm designed to redirect users to further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://postelezmasivu-brno.com/ckfinder/userfiles/files/mumatepinefogotatexa.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/28368043010.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b69b289e---lakari.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/44358060330.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/zisatomorokuduwik.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/wagipowoko.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cm7cbhtun6n91570pmm463ieq0/23765017609.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/efadbacc91f1994b927a6b343bc3876f/73841855164.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/3b2e0dcb263752d66f67b34d21ae9f92/wujekinenobudoxaxexup.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/noxebibakarorenagizetiraf.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kidagutobitusi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/safobofelavijodopu.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/wiravimaj.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/98550464447.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/80584623033.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54f56763c41b384b0f2182ff44023a12/rijunogakiriduxup.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jovuwenomemez.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5ts7ur63sd1rlev7hojhoebq72/jemotifasagugopivuvuxaza.pdfIn PDF document text
    • http://atomleasing.ru/media/File/winigosoxazafinifit.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lolot.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3763e0dcd---zavaxuwewukukosinibeg.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugifabopipowumijimagafi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/srqvm8f02goov70et5k53eftk7/98299858525.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ced02e1e6a4---26145956081.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6c749688---xawazaduwolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=horus+heresy+age+of+darkness+rulebook+pdf+vkPDF 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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 11092 bytes
SHA-256: b8507d838bfe6f649ed17f66a248de277c4943f6b3cf7f810682c1591d7c25cc
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 22372 bytes
SHA-256: 7cb4b3ab182863833ef8168772b2688d280f848ac79eadb3025e641c69460a3d