Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ade413c4234413…

MALICIOUS

PDF

74.7 KB Created: 2021-06-26 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ef5eb13caa4d2f32a1ad729d76492ff SHA-1: b7a7f2f11c7f1c9deba6b93d32d8ef84957f7ad2 SHA-256: 66ade413c4234413f406b77cddc88258789397aaed42559a0d2b5597b306e36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various PDF files hosted on potentially compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it functions as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=modern+world+history+patterns+of+interaction+textbook+pdf
    • http://inimtrento.it/userfiles/files/burakimotavosezunefat.pdf
    • http://huile-de-nigelle.info/userfiles/file/nogekizetutelowulavenav.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee218b326---20859903364.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/memetarinuxabewuniw.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2ddc6b3bb456da934162bd1fb7a388ae/96351919659.pdf
    • http://hasyo.net/files/file/364015967.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8c4993b1---xobegopuburufeti.pdf
    • http://alexhofford.com/temp/files/file/foxiki.pdf
    • http://hanasushipickup.com/uploads/files/46635239228.pdf
    • http://zaun-produzent.de/userfiles/file/vijepekakufudobew.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d6219cf77d61818648f4a15a1aa96308/47837834371.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0e63e846---12266206245.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5bac031522a01a43966cc77eca589a5a/dulaza.pdf
    • http://angelescare.com/userfiles/file/52877711507.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091377c25561---mudapisisevag.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/27f522e3a520963166c7b048744b1a4e/85166658484.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lpp3ijj3kfd7euke7i375qo42c/jiruluxemotazobavala.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4daae841c---69394999591.pdf
    • http://capital96.com/userfiles/file/6620011199.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b97f043fe---pitox.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/da04c189d21479beb2e9c469b00a766e/kuwunoxuwikebaxamu.pdf
    • http://ahxxzx.com/userfiles/202105/file/60496878152.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b991d238fae2fd356241d21a36d77ca8/jujepatufiwusigejubeju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 16792 bytes
font_01_sfnt_off0000d4c7.bin
8b242f1cf8b74dd213b9eea42c68314f8634e1036c6a5558903286b16607ab11
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 11244 bytes
font_02_sfnt_off0000eef1.bin
6b6a335feb0204d96c5c72904e8093583a13e93cc71839e89c49985600e393aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 17228 bytes