Malicious PDF — malware analysis report

Static analysis result for SHA-256 4712466ced87850e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 04:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 231460d71145a5707f846d7289df5d79 SHA-1: 39eb6f5593f13f5867e889c8514b29010e549cab SHA-256: 4712466ced87850e9365647cebdc1843ad3f2afcf0b77b8a8248448230fb49de
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host PDF files, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e4be02e16---bivowilowo.pdf In PDF document text
    • http://sevinctekstil.com/resimler/files/nekozoxi.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/putisewotajowibajumigi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/xikibotojuvakaman.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/wowakuxudusuvasuzujaselas.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/9741076653.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/bufifibamikevopib.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2fd2bf5ad76212715a75e130eee09635/lozofalu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/vukigogimogipiweg.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/74198565081.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a070a14bb48---25447583658.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kuzefesoda.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7677c01ee1---19999256343.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmsmm0f3hc4i302om0pa1iegg4/tikazekunejulojepiwoxa.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/3792526644.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/1b11664cfb2ce0269ba9e9067a76eb7f/28741498115.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/55834222498.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c22142e19---49273846456.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/96838127277.pdfIn PDF document text
    • http://ladna.pl/user_images/file/54540492017.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/venume.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/daleregemis.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9d839a5816f099875216c77094ed8de1/bajuwa.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/wufezezadukata.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805c3d785af---tipuxotidefowafepifotoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=import+and+export+of+pakistan+pdf+in+urduPDF link annotation
    • 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 18564 bytes
SHA-256: 8a21075b1fcf68c2385e8b6d248f963c6c0e17a868d96f119657c86e12597e8d
font_02_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 10860 bytes
SHA-256: 1f383e6cd8bd4c83c25385d552c7ca693bed7b65b443a6170af45303f6cd8911