Malicious PDF — malware analysis report

Static analysis result for SHA-256 2282d5bde060c19b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 15:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fe3fab394289a7140e3d79cc4771cd6 SHA-1: 43d5b0dca403abef4592f8fb9f21ee52683f700e SHA-256: 2282d5bde060c19bc579ae439ad2d1b28477c6e0869b54977d711e4834f22269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, likely serving as a lure for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=how+to+add+to+home+screen+on+android PDF link annotation
    • http://energyexcess.com/userfiles/file/49792969743.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/5521202549.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/votif.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/58393511814.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/tigiwegikiw.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/magizago.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/63661360624.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/marexojokuruwalofimara.pdfIn PDF document text
    • https://hoongnau.com/upload/files/digigijivomifek.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109060033497297.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/78131pron32p2t2rrtiojivj6f/60765521142.pdfIn PDF document text
    • http://beiks.info/public/file/gasenidodawuxejul.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/lakipovusujipefi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ff434fac---penakana.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d1680d4---73627786395.pdfIn PDF document text
    • https://gdaniec.com/upload/files/69184876312.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/17412380821.pdfIn PDF document text
    • https://premium-house.uz/images/file/xivikugajowevezatipakib.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/67192915192.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zoganalijaremizegesaj.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/65808866306.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/gibikiwomiwaboruguk.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/64723075327.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/32838128836.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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10668 bytes
SHA-256: f0f9c99253b775fe190a2304d4fd24db50ef42d0e0293c4fa456d70279b3dc47
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 17636 bytes
SHA-256: c955752b2a1739c0a20ece455d6f02ab5cda78b40539f0c850b05064cea064e4