Malicious PDF — malware analysis report

Static analysis result for SHA-256 c642fba49ee4d5a3…

MALICIOUS

PDF

117.4 KB Created: 2021-08-11 10:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82b3d430fd95cb8167222bca5595e657 SHA-1: 9a8a9ca11d21e7a6df9b6c807ed260a8d793c79c SHA-256: c642fba49ee4d5a31c8fe48b7e700942dc0e7fa5b45a073c9105c6f3b8eabfee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://pistant.ru/uplcv?utm_term=a+court+of+mist+and+fury+target+special+edition PDF link annotation
    • http://seibyou-koujien.com/files/files/gamofaginazogun.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/74674234036.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/20429207006.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/winetosiwod.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9adad8f7d2c342356e2fb8b66a071a6e/49140192121.pdfIn PDF document text
    • http://candientushinko.com/images/file/rokol.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/26r67qm8mk7jskf57ns1551043/bejolefugu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/41c42b3353139847ca29f1447a646cd3/gobifovedu.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/kenidutufexajom.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/97542446211.pdfIn PDF document text
    • https://angkagenap.com/contents//files/dedanutafivovoponuk.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1c3dfda0527ef632c6abca55b2b9742/62817270818.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/58d87be417b36c6f400677d9cad47eef/vavamovexugoxujol.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ec1744c64---kopit.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1fefb6a165f159f31bcc18f190398194/perobilonatiboguzigix.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901040d336b---dutomezutoretutosuwevo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/154ebfc8daabba934573193f3e2f251f/rubufigimi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/24769148193.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bubakagesofefuno.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/kowerivalo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090883fabea5---mijevewixirividareradem.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6d02612e---fedumuxovajixelanewagoleg.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/26245196593.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/beriziburokejirubetakab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AD 18780 bytes
SHA-256: 027a5525748ff86a7a6c88f5e8fc74e8df9ed8203bf3b887fb755e7e8769e6f7
font_02_sfnt_off00019527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19527 11160 bytes
SHA-256: b0f61b0ce38aa701b0780bc57f1c6c5c07b97cdc9219ebd3c7325e117eb4a206
font_03_sfnt_off0001af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF18 16484 bytes
SHA-256: 3a0bebc178ed231514679e5ab461a0bc496fb5a9fab3ef3f7030fd0ba12ca93f