Malicious PDF — malware analysis report

Static analysis result for SHA-256 e313754e0c93f985…

MALICIOUS

PDF

73.4 KB Created: 2021-08-15 22:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8336f0a9e596f58972f20db2d7b490f5 SHA-1: 4a6b75cd214a23f086459932d8c373996c3f1bd8 SHA-256: e313754e0c93f985cdd89d319b712555d8d7c54ea2d3ea24e396b41687e5056f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, many of which are hosted on compromised WordPress installations. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9041

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/kih6alo4la8503vh27qo3l9g3k/14789918528.pdf In PDF document text
    • https://hcviet.com/img-phuctri/files/kuxusoruwuja.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2724d2fb0---mujenazedo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d42cddaadecf0c6e2e135747379e482/xakipajanaxojaz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a09bc3b---varaz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72613946d---xuzegozivepofima.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fapase.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb77d037e8---semamewibuxopojule.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/15fe5c7383949c59f13db455d2be0fdf/29483511586.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/89647055156.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/30f0d188edc68ac4470d44aa01de9223/32436801645.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/07e8ae1c7b2accf1c6575024b2f686dc/9015018175.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/73027658131.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/mivudotisadukarorajapiliv.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3512abf3a8ff334b1c80911a8ba7b656/50011349757.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b84af155633---55787364767.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f0f4881f---18650039042.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/22370688200.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756f95f033---dojanuwilesigib.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5919dd36b2---tuxebikebefoxesorufi.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/vefewunejikurilabe.pdfIn PDF document text
    • https://brs.jo/userfiles/files/gitunovu.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/57674586009.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1421647f89f9c7fbc0547b1e73c43c2a/mefijujemogifotuviki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reaktionsgleichungen+ausgleichen+%C3%BCbungen+mit+l%C3%B6sungen+pdfPDF 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_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 11748 bytes
SHA-256: cbe53c9847f558b2bd3ba2263f5311d8757299157f43a35898292df26c18ba04