Malicious PDF — malware analysis report

Static analysis result for SHA-256 7790225589e0f181…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 04:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e217215d8284b2b87f0334211e988d9 SHA-1: e0daadc0091c19284bb6734bc52d02a237881528 SHA-256: 7790225589e0f1811564b552e189ee7be249d7c5a6060e2a702e3e28e1927a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing attempt, likely disguised as a helpful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=how+recover+photos+after+factory+reset PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/478c8db85a3797a1edcf64aa32a5e9d9/xuzatubakiwesepe.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/63168082006.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210914035353.pdfIn PDF document text
    • http://allasclub.com/campannas/file/labakovavazap.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/56348105882.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d040d8eea2---rabuw.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///panubofe.pdfIn PDF document text
    • http://state-lithium.com/upload/files/zokuleged.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/mebeworaxadejedo.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/sewomusoterofivunabom.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/57e3c779feaf1c2fe583a28c2808df2f/nupusomaj.pdfIn PDF document text
    • https://aedwea.com/upload/foto/64946262535.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zozakiwexenipep.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161369d66d7ce4---24326555272.pdfIn PDF document text
    • http://m2m2design.com/userfiles/73356039839.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/1221109236.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/mobitagipozejevi.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/dunowa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a9a8061490361404cc305044a4ff9edd/25732986005.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/39907649361.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/lewasekevumoj.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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 16772 bytes
SHA-256: e7116d3f466fafe65f6ab0a409e31f3e6b301c674d6f703a385043a9b3e5a3ad
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10592 bytes
SHA-256: e27625fd781d005e8a7a7f2543cc9ace35585a5af532dc831d9c6ee9c9ac3ca9