Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38a773ef43df725…

MALICIOUS

PDF

62.3 KB Created: 2021-09-06 14:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa3f8a35336ae45d5cb044e53dd50208 SHA-1: 628e782ab507873b753cf8b570805f1860d20930 SHA-256: f38a773ef43df72504f4dc7144bbbd7d1a07e99401bc3e92f8684b0a339919ec
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

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 https://nomylo.ru/uplcv?utm_term=tenia+solium+morfologia+pdf PDF link annotation
    • http://10glazsikeyrosa.ru/file/nujibapudutezaja.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160abf846145a1---tebunebilope.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ca8d6c63---26019192610.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/26653644318.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106030117255375.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c241b1ec6a3d3196fdd984c3cc27b862/68206315705.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/76872441183.pdfIn PDF document text
    • https://yasacompany.com/upload/files/84530969356.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/81704135241.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/88112522789.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • http://tai-group.com/upload/files/vopafefawutokimelawimo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67e4afbe2---54177802424.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/dusal.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a109f8a3a6f---ruletexavaj.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/74698879645.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sonosuma.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/69052205671.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bopukipiposivizolitab.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d327482b---56970224157.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849476c2cd2---batigu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10804 bytes
SHA-256: cb2b412472bcaa083f0ce0ff0f067c6a46d65228707d4c4d870adec30f637527

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