Malicious PDF — malware analysis report

Static analysis result for SHA-256 a323f516f7bd1be0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7f798983cc0ddd911dac486e75d4dca SHA-1: d0d45daa6037695233b2036f306b74b3ad87f625 SHA-256: a323f516f7bd1be0d9ef700d55fe545be23a2d30ae284e8b8fab9ea39b31197f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b67052996---wokegajofomi.pdf In PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zivodokewuwirosodosuwisuj.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7mpd9l6666ffmoug25pe63afos/12149672993.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t35bkcggnhgjkdcsecl14lkfpu/bixafarazerazowoved.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/9878292223.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/karevuwunusexano.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/82535173326.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/92692794163.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/8142705904.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb83a2cb64---72926928250.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/76809248016.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/bulifovikugaburipowajo.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/54708367090.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/71599158061.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/nijalajeganamiw.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/87437496685.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64167470636.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/55221616342.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/67972599028.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/28665756017.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/90272801074.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/gugikamewezuzivi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/51224138230.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/45117592653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=crazy+rich+asians+full+movie+online+123moviesPDF link annotation
    • 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 11220 bytes
SHA-256: 1e975454e2788e445a6634c2bcf15aabdcded61cf4382332115c82d4f5dcac62
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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