Malicious PDF — malware analysis report

Static analysis result for SHA-256 6241c2a92122fec9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 20:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 536131dc75703b8cd7b09f8a9b64d3d5 SHA-1: 78063cbae1934712d2c0949c24df73d2cdae5e6b SHA-256: 6241c2a92122fec9bfb8a642d07b44ec9d66246df2ba1ce30f5c53c819bb3794
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sayurmateng.com/contents//files/sisamaxinegumu.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0b477d7c6---22505985999.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rtiv1r39omqcmfmt861ba4a4ts/83853845513.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/mokovaresowerurowidotonad.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0ee78cb8af562767bb7b5314494c1dcf/96311939977.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/44087773924.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075af92a969e---55833124618.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/fadetubaxurulopisixivuvud.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210626002835_67pcie.pdfIn PDF document text
    • https://digireg.it/upload/semoxofa.pdfIn PDF document text
    • https://posh.hr/files/zugelexipoza.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3c6f2d3f0edb3a006da9c563977c06d5/veweluv.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fagakepuxutuviwus.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d682b2f1077---tejajuw.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/bisirevegixojowuvevenat.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8ff5616bd---jisogolajotek.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc3ea0380---41080306445.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb7d6d3a---tavalifikujogetasovi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4c5750327fbda39d335bbc6b17876c4a/13880814312.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b04c84e4cf---gagusadaxizitanir.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/20169839849.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2292077e7296f4a3caf1b90c8ae71339/regugabupugaz.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/32644849456.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/84950991033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+war+of+the+wall+commonlit+answersPDF 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_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16972 bytes
SHA-256: acbd5878080ddf33e67b242eebedab38d7eb151c9ad96b92922233b3c78f1e47
font_01_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 10648 bytes
SHA-256: 8b7dcc83cd8a612c7e8b7823207a22a84219263f8b8f66ae1df26b051b519105
font_02_sfnt_off00013efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1