Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea7337aa185587b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 19:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e5abb10752f062dc54d0b0da2fab095 SHA-1: dd9a558251b1d6e3f3759dfe5b216138e112d33f SHA-256: fea7337aa185587b33c1a56eac72b0918992be24c01227274e526872fe60ea8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns align with common techniques for distributing second-stage payloads or luring users into fraudulent schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=multi+select+recyclerview+android PDF link annotation
    • https://loyallcanada.ca/editor_files/file/24299603766.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/8476481205.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/wogix.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vagaduwunorijizuxita.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/wimupuka.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88406677917.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/madiporipanota.pdfIn PDF document text
    • http://ilovestory.com/upload/file/lelokigejez.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614077ebf3b47---69384182206.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/88050839089.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/31347141693.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wugibomovirigoliwo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7f89279a713b3a070eb9a90e40342208/kilutigixi.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pogesipivobutepawajuf.pdfIn PDF document text
    • http://generaldistco.com/images/file/wapirozamosovel.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/24115087385.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/46938294922.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/33909441028.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/fomekimudezirejo.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/87979325710.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/93366408961.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4f194b3f---jufonegisebugadowakobe.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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 17468 bytes
SHA-256: 900fad6fe7fae53c516ff23a1818eeae3864efe4bcd5da131215df7925a1d130
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 10724 bytes
SHA-256: 510ccd24084b65dbb219ca4b452813b3da332dd0dbbc6250e2bfb18e7ed2cfc7
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1