Malicious PDF — malware analysis report

Static analysis result for SHA-256 2511d94eaa27a92d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 15:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7be28bb183fa94ae06537fc80f7d3f7c SHA-1: de1f1f8a522705559d8d7047ee1faf4feeb08627 SHA-256: 2511d94eaa27a92d7037c2917fdb31986d42f7aa98a49b6efb910f29559d2826
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document exhibits characteristics of a phishing lure, specifically targeting MFA or one-time codes, as indicated by the 'SE_MFA_LURE' heuristic. The presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggests an attempt to redirect users to malicious sites. While no scripts were directly extracted, the overall structure and heuristic firings strongly indicate a credential harvesting or session hijacking attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://nuraski.pl/wsg/userfiles/39319193937.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7a36abbad33d526e2169849fa80177f8/91479019543.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/22155402693.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109111519392139.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/90630254097.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e271d2de9b1c29dc9c5351ef74b5b324/farabowevopekukisero.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lipazirazodajavofazewasa.pdfIn PDF document text
    • https://windsbs.biz/files/file/99219962954.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458725bc27c---waxokexorexovi.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dutuziramofupufotugejajum.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jalupezomen.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161319dd2c84d8---tobugakav.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/46668915336.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912100815.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcfd8ad2d---75909684062.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/beruda.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fowubefoz.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/xikovaxi.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_091755.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416b128a7d---gafinezutumabekon.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/lixokemolow.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dobogupevik.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1fentprcdehnjr6t4jvqohrfd7/33172213553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+connect+wifi+without+password+androidPDF 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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 17916 bytes
SHA-256: f111cabd8abf4ce84c8a35feb7b5b9e6eaafa302ddc4172ed95ddf66891ccb73
font_01_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10848 bytes
SHA-256: 1fbd22d71bb91d556586c50ead25ffe4f1df1e366ad10e3179f5797085353308

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