Malicious PDF — malware analysis report

Static analysis result for SHA-256 f419d7ac977ffcc8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 21:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c27942c601f9bb239323a5e13183e95c SHA-1: a8c1421c58c89a70af2671bbb6949c8fa79f6f76 SHA-256: f419d7ac977ffcc8dbfd543ec248ca1f87a8ed32cdb63ac2d6354f1389dd4a20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised web servers. The ClamAV detection and ML classifier indicate malicious intent, likely to phish or deliver a secondary payload. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/m4k5cpc5lau8u47ei5peo8hm35/munafololovaxinu.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/95824314678.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8373e63e88---71676086378.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/xalamugibonugek.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/70490250593.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/79170512434.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b92b34c9e---vuvimiwoxepozeregefafuzu.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/67895657423.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb32618e4814350e0c15e3d0e9bc3ef/dulipibugabipomoz.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/44759991560.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/tixalezux.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/37133678855.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/zaxizivojis.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36054738113.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/gevavadipomujapu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6fb895bd3d9d4288cc13abe70456a77f/mufimamepijewara.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/41967912166.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608268ab0ac6b---89624901090.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a6ea83ee806deaa4ab18326ba83c491d/98351837677.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e8e7717645d359d8c90f7f0c3d6fd4f6/buretilosubokolavu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/57qae3q43rkf8tpe90b1frg866/17931989091.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a45e47decab460a22bce5c09c2f2f498/86942122205.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5srt4ss6g9ik6tca1s4mcg75o3/93045023553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=contemporary+security+challenges+in+nigeria+pdfPDF 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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 11312 bytes
SHA-256: eee2665debe35d4915bfd0b3236012d947334cb71080efd3bc7a8d227c729d14
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1