Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd79782b17eec41…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 02:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60b18ebf2a30a9ab08994206ee332cd8 SHA-1: b2dbc3b3aac5b5adcffd671f17f44c79ce955244 SHA-256: ccd79782b17eec4107135bbe223ac1ccae5dd7aa025a0e27e95440088676c801
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saharun.org/uploads/ckfinder/userfiles/files/vepuriwamez.pdf In PDF document text
    • https://x-software.cz/data/file/67402060295.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1e776bcfedfed04f40d9b2ab6653bad7/voxevetidobebedata.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/joliwex.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/ronodulenoje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd32b0edfa---24520804655.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/jutitibobekimelewiru.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/koxavajimakubugijam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a5336bb4---fuduzalukadobi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e59780b6351---72012663280.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tigawamo.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/88825760618.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/915c7db24870b5c39025fd7e288e2213/pafedirexuzaxawenanub.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608056cea98a3---96471612022.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4990d996eb---72250928219.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3d5a0d13---kazezelama.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317d5d4452---juluziwo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/56364769537.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835f55227e4---38436709946.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bg2bppb110gl5qhf51a0a6p387/kiletavupuv.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/lufobagesuxatubedoxil.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/65945838901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=codes+for+tower+defense+simulator+2021PDF 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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 17252 bytes
SHA-256: f98ab9dc04ae970bc76bb734368db6b84694509697f18b1ec98c9c03d6cc5d37
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 11028 bytes
SHA-256: 6ca93f48ec4aa37a9a43b95e02b1d2168b89664f190d3054696cff24ad7ab74e

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