Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df8a0bb8796fd65…

MALICIOUS

PDF

78.1 KB Created: 2021-07-19 15:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a19255c77882a774fcb95932138c849a SHA-1: a95c816ad58e0273588f72c201a8ba15f8e0a9f3 SHA-256: 3df8a0bb8796fd65d86733bab3fe9304787beac352358c194b90d7e77ca2e791
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4650

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vivijinabijemizino.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df7bc50cd---67043149318.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/66429851591.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092edd66eb7d---92480493033.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/jupewadigo.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fukabixajuk.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zojakamagipowuz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nizuw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vuwijomomidufinerifula.pdfIn PDF document text
    • http://tochalco.com/uploads/files/40909836129.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g80vusko5sm2sg36b0bhqnfbi1/raxusexowapinusijezo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t1qdr10j3g00j2g9ica2vmagls/17898640838.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/pulakama.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/21440464018.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1847e30379b7ba6cbc7f074d2bb565e3/wepixijofimatedase.pdfIn PDF document text
    • http://fabtur.ru/upload/files/86226185194.pdfIn PDF document text
    • http://mcutech.net/files/sodudepetukon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1be939ddda---linasomem.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmm4qj6u6d8r113139jlvu34v3/wimidoxijizewuxatetotu.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lonalokuxajudaloli.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kimql2nln83tu179ddlopd6pq5/giselijodisagufob.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/dulagesuw.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/gudan.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/rubuxipodonoretamegup.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298681cceb---12390774867.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e318907c5---1364608275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ringo+starr+and+all+star+bandPDF link annotation
    • 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_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10476 bytes
SHA-256: 4c0af7b4732d96dcec4b12f18be7c3c5cb8aaa31f4ae3d2c854a1d8ade24d34d