Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8fa80a350d36b6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 13:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48665ba0aef3717735eb0afc24283e0e SHA-1: fc4117c119400ad820c2f24d3d65f9602832e3ab SHA-256: 8f8fa80a350d36b6c264541cab380d103973678856104cbc3dc96d08150103ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=what+is+junk+files+on+android PDF link annotation
    • https://www.utn.ac.cr/sites/default/files/files/3862616094.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/rizewiweduzema.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pufidetavexodelixa.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/99322484417.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161403e7e7392c---10989956392.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/sepovanizopuwifetevomilom.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/593cd97f7f2dfd3c3df41091ae99850c/surezozeruxepolebe.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912133645952.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/41783014227.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/rugaxiviporujaliduxit.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/61267340291.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/48016720480.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f44ac6c52b22595235f0367705da14d9/forijuvukonavokopidonidif.pdfIn PDF document text
    • http://acril.ru/ufiles/files/48576388838.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/zedexizixetavebe.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/vewed.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f12687---12578488658.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141394b11dac---wobalulepowinew.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/gakunidubado.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e04dc8a4---59559554772.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/542688fb46de8f8003e13cfd351a3796/lepizevodowenegodipeno.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 17644 bytes
SHA-256: b972cd5a75145d471e72df03206f67e86c8508ab0d2861650578a3a6ca8d1789
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 10768 bytes
SHA-256: d9489765e3adc894f3dd8a23f10bf9df0a2c4e1e6a1acf8d15b8b3050ea2f538

Open this report in the interactive analyzer, or submit your own file for analysis.