Malicious PDF — malware analysis report

Static analysis result for SHA-256 daed538d89e448cc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 07:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a1b0157a3234d64e80c22f92e2b864e SHA-1: 1f4cec30cdf393438cd76baaf326485a9af9be31 SHA-256: daed538d89e448cc6b649b1a150f5c01a8064c6143e9018aed3ed741ecb0bbc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host further PDF files, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=moneygram+application+form+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c857c67ab7097db4eac3ce880c7dde/suzidiwegesetar.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fotitevid.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/krbdakngtsebqilepit3afjuon/giviloxuboririwajija.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c3d19d4d---xupebixilare.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/ranupoxesumosi.pdfIn PDF document text
    • http://nineslash.com/user_file/file/48141186362.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0e3efa251df67389a83b609b7e8721d5/91164068893.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d8950fd4---44312891449.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/88490982266.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077369166ccc---jajigisoxuni.pdfIn PDF document text
    • http://stevis.cz/files/file/lujiju.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/20638812685.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kokugepebelesiwupot.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/regadixixewi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/kumumo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5nsp47qe6nk3ecgkrgq6n09ig1/57551336451.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/25138340338.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076496d2f608---3030843646.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/maangcqvf39n874rgloppbrhan/24716134513.pdfIn PDF document text
    • http://uco-kampen.com/media/files/31818046843.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87191486125.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/871690f047713380c6b0491715569c7c/68065054327.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a1d57e63---fofuzire.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/42320326578.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_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10904 bytes
SHA-256: 26c85efedaf78099e0f057dc8f152fb3aead553ddadbb532db439f6c36c16d6b
font_02_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 17980 bytes
SHA-256: 69beb222c06f1041b5ca70f69c0316e4d1597ac69c5dd04ee72be57844201452

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