Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb660ecc3dfa80e…

MALICIOUS

PDF

285.5 KB Created: 2021-07-05 06:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4e3520cec13ca6c11d58bed2362bf7b SHA-1: 09c0c5789b3000180d0f2eb8a7c00dc3e6cc4096 SHA-256: 1cb660ecc3dfa80ee0f42bd7e4ff630ea3b0312309fb52c55912a7d645d0f0b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=term+paper+outline PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0d754967---83934163174.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91455092011.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/jodozed.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/48820928663.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814656a97f---6116909702.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a2610f5577b6817641b808b067c92df7/77315952373.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d320fd7a2a---xululasamebawaga.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/514655dcd62a16e09157d6eacd723c26/70021753559.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/62409227584.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/06ra61n87fve9dgb5bs29u77up/lufepijupelunenaz.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/jurepuvevarodugogasoduv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dc555454---47125316862.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e63d6dfe---tilolozukegasuvexor.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/een6jdjmo35gnm2e55ttpei0kt/98593700987.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bojizitasaki.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80216555bd---tajoxafudelukokul.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/16fd36dfe071affd9f4e9cd327361aed/77379759899.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/59657684469.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a633e73a2---setewutopalasakikumote.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68752106112.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35876024167.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/dad7d83029000fbd5365113f11e3f14e/remigoforadisude.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/budowesorirituviwivevap.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/fobitokop.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tapadetujijiwojelisawixi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/suwulijefajiwesem.pdfIn PDF document text
    • https://cargotavio.ru/files/file/fexidovazuxanuzirima.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/21650929967.pdfIn PDF document text
    • 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_off000406f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x406F7 19052 bytes
SHA-256: 38209f360ec2eb015f0cc5cc0a9599b24620329253558411e9e03a68281cd637
font_01_sfnt_off00043824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43824 10308 bytes
SHA-256: b86b7ff86e9064d2d7d3f4dd29b8f4c6e7040dea5ceec165b10ac67929df85a6
font_02_sfnt_off00044f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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