Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c8fc4cdca49eeb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 20:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a59989af0a0a0b612031638551850ec SHA-1: f2ea4d211a95e37662f396b39c0f50d75af28149 SHA-256: a5c8fc4cdca49eeb597562d1006ccb7e14600e7854b6f1f1b6cd28db601ab2cd
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a phishing or credential harvesting campaign. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's explicit intent to solicit sensitive recovery information, likely to facilitate account takeover.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hogozaty.com/ckfinder/userfiles/files/22114643767.pdf In PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/wenojisuzedonaridimu.pdfIn PDF document text
    • https://foulardfotografando.it/file/voziwo.pdfIn PDF document text
    • http://hkalc.com/userfiles/36698356090.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/864st9eh8oeuoicqkao1h9gt60/68122355203.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/82220468027.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608444dadc7af---69120142918.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ddb289f15---56541569005.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/sofadazisa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f111c382---37258088205.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a1af40e2---nimopeni.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/vanabegesezef.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ea23f5b628501c7a9ad2fc87c474048e/91681408021.pdfIn PDF document text
    • http://stevis.cz/files/file/56064696461.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/87573881806.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/40998486972.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/46775069485.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/54149348562.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pikoxuwefovake.pdfIn PDF document text
    • http://fgosvo.ru/files/files/bibapejawijirurad.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/8506803081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tellstick+duo+manualPDF 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_off0000c317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10588 bytes
SHA-256: 24a841e7a849128e97a8cc42703077f1e02db7b7d8404236a5b934e3159bf3ff
font_02_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 16620 bytes
SHA-256: 683c314b8dda733f81e5ff6a980018bba94ff390757cbb3575383a7cf8d79f9f

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