Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffc812ca3dd8b57…

MALICIOUS

PDF

88.5 KB Created: 2021-09-08 02:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 466b3e40079dccb526ca81777b5584b9 SHA-1: 5207d6502c109457c6806c1d5bc0777b997010a3 SHA-256: dffc812ca3dd8b5741add5df58f8be0f31bbbe78f7b8bd3e954279d19dd03243
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4603

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=create+a+worksheet+title+in+excel PDF link annotation
    • http://agcslohian.com/userfiles/file/mogajasunijeresejijo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/375bec7234291dc2d732fccd0fdfd41f/85286664241.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75ltoatku0mav56uov3j932as3/neriguzerupozon.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/90170147250.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076310aa47d7---kamapurides.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/62963974705.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e07006fc4---29161505939.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/lexubupemeku.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210626063428.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd4a091261---nikofi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/96043959431.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f6315d349---runolubipomizomawadalijo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdb5819a547bd88305559a7cbdf0db96/misaselisunizo.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/85095274674.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48381211999.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/zobepoz.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/20603455346.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/99453715177.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xevome.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/42222923090.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077673b9b210---bufuzojom.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10636 bytes
SHA-256: 50a377df6bc379ff07ed3bb3fddeea2f8e7a8191e57c5e731642efcd45535532
font_01_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1