Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1609ccc3e6faf8…

MALICIOUS

PDF

86.2 KB Created: 2021-08-14 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acc07fdd58d3f9d9598ba58eea5ea18a SHA-1: d6a013c308590b490c4aacd06e54278e9cc97e3f SHA-256: 9b1609ccc3e6faf859e3cce4708352127611e57755224a82afd9b770e46b7c8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure are designed to redirect the user to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=industrial+revolution+webquest+answer+key+pdf PDF link annotation
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7d893b9bcb3c1b62095b263725dd4a8a/75061816761.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7eca2e7bd2e5491cdd008081a09913ae/wasaj.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/11713321079.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/59770409876.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/nakusu.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/19615444106.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uumrq96st8s5die4euc2tkvf97/16310110858.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mapexu.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/wixisarawiju.pdfIn PDF document text
    • https://fallsplat.se/file/5673943921.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/nixudefetiragiwozusanebu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75512967345.pdfIn PDF document text
    • https://birudongker.com/contents//files/53600825334.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfacf43c789---54714957630.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e190ef3e7---kegapuruximopafukeviz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26c8b5756---79368791163.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/33530441113.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/98098058759.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/70344145192.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/48464701031.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/88947125897.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/12858535248.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a625da10---vuxupodirano.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kujerinazokinel.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xuwikovu.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 19324 bytes
SHA-256: 3abc6427a7e7a5b123a2d374aaf4fd2c9ea43d32e8c5a7a770c62c653d020c4b
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 11188 bytes
SHA-256: 55d904e87b1846710516eadc12de6c50f2ff6c1e354e6abd87f684f27913f940
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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