Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ad3f4ba08629d6…

MALICIOUS

PDF

64.0 KB Created: 2021-09-08 11:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c608182b92c88bbe9cf04df080e9922 SHA-1: 1b71edac2b64c7c3ddf32c3347c2a1bde25c10fb SHA-256: 28ad3f4ba08629d607b54780b42c9c65880aa75e4515f76d033b8f5711727871
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16117e9146785f---lifotagezofivikobagafo.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/20218311926559815.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2461529ea1---30533367972.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d9fa7107---titefopepevasonuni.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607702257d7e5---27844732535.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/rubuxonozatobojuweb.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/fofusozaja.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088727be6302---jetogunipibofobaz.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/66728205622.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/luzokewevuwupowitovetixa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dq6htf6dbh69k6p2hl8abnq285/28254232995.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ec9f5ec---zebepeximibomajokoxipibef.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216206562944.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/furajusosaledavamuluxa.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sixakoz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/32268391704.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bd14cbd2---pawidif.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/92497609486.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/nuredobemadofig.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/b4srb57jmiml9rnqkjpjbaln0u/piwerexibalosesaliku.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/buvemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=days+of+wine+and+roses+lead+sheet+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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