Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4ea1da27cb8adf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 00:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae603950c4c744395ab28f8cb1e1ffff SHA-1: 05992eb99cd40fc918e23ccd61812b531882b4c4 SHA-256: 0a4ea1da27cb8adfb347357dfa0c9ba7293eca828372307734683140cf9f41ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate that these links are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=copy+image+instagram+story+android PDF link annotation
    • https://danfort.lv/userfiles/file/35006860706.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/16876138868.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/xakakulapolidevuki.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/suvepogeladukutaxix.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/dejolidawife.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/pawogajibaxazovirof.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nazulowavudenidezedibo.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/90024091502.pdfIn PDF document text
    • http://asustainable.com/global/file/65828604903.pdfIn PDF document text
    • https://windsbs.biz/files/file/kegefub.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/69066277660.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8c827b1f---wagawu.pdfIn PDF document text
    • https://cecprint.com/images/file/lizom.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/penanojinovu.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/gamivuxezamawazo.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/47755605860.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/molubijozadava.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/29349121778.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352bf56f8a5---duwiwodiwisawazuxivi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/44761953869.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/56736652057.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/11761195537.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0f1f2a94ac183f1995c99fa1b3b34192/76880789281.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139258f3924d---8199243807.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/22658498614.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/vavanowikixabud.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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 10836 bytes
SHA-256: e338978b693b2e641743bf8bc076c137c4033f789e331d1aa0ec7725d812220a
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 18584 bytes
SHA-256: 454eb476d30a7cb913a4f8eb528cc604a199acfd70b4ef1336c43cc34c152db0
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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