Malicious PDF — malware analysis report

Static analysis result for SHA-256 5335c9e5d7c83393…

MALICIOUS

PDF

93.0 KB Created: 2021-07-29 12:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4ead750d5fe07cd9aeb48810ce26717 SHA-1: 65c646764c53113791fda8da6586ac0f25d67230 SHA-256: 5335c9e5d7c83393a881aa538b04b6957b4120eaf6798a44ff79f19485624638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3ilfjuooao1s8voaumfcfia4sc/33348859288.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942aeb04b02---93390569342.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5k25hchndmsjjc0g7u9a5no04/95661313580.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tepaxan.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/mijuropowizuvego.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/jejutabajax.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dc406f017---jezagamaka.pdfIn PDF document text
    • http://keacg.com/upload/files/36704553408.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/65557257955.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/fexusowiwiwibebatag.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/16150634540aa1eb19d72068fb848f65/33504334793.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/19705477004.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac914db7a1c---82782654159.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0i7mbbl0mdbl5hl9fgoarfhmsg/43330894778.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/13012299974.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ede2353ae---faxujumutubazowif.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4acc2qhnll6g44atrogmuc0ml3/salutenadizimewejar.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/lusor.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3e3b38c3---75809418991.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858ed614c---58747582819.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2e895638cb4d765ba15347bc0e56343d/65103902385.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/79086585263.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210624130126.pdfIn PDF document text
    • https://mauspro.net/upload/files/kusepobuxegeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+long+does+it+take+to+cook+pasta+al+dentePDF 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_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10756 bytes
SHA-256: 48b5ccf04310d0ba07365018efd09b9a205fe270ce3ab75eca3b907cae1e2bda
font_01_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 17324 bytes
SHA-256: 79af11c5d9ae3352346e9b989f7e95ee6c29c63bc97b2569e094a090c490700d
font_02_sfnt_off00014bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1