Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b24e72819338d3e…

MALICIOUS

PDF

84.4 KB Created: 2021-08-28 21:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80706c814c6c615f53bc19e0b5fd56f1 SHA-1: dcc5804ebcae0b5ab1ef62a19f179ef3189100b1 SHA-256: 3b24e72819338d3eff62191a29d460214f9f52e3662d01e85e8d099a3335bcff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The presence of multiple distinct hosts and link farms suggests a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27784b088---88023596715.pdf In PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095502bd22d9---mobonivobupafisugifa.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dusuzujerare.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94ee915a1de219528dc1490723c8b5aa/59014765641.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33109002---84463903125.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/84229207228.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9fd5ae80---davewelosabuzunizevigaso.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108250927565035.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/8153714448.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/dukumutebimejapenugukoz.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/goxorogezazofag.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3222225affa2c45e0a959ca0327717bd/90346219729.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba4a96495---pebabalif.pdfIn PDF document text
    • http://huimao.com/upload/50260146439.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/bavapulomewuv.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/semefekudunawebipubazef.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/20e90bd1783f8882559721f06e14601c/86187250393.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/82468792907.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/63113194233.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vitama.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/88242a513042e2937e4ba2a69ed81766/16398958238.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f617bed28---vidobilitiwa.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/kokolikuzisekexaronu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/91a53d364e79f9e86a40e837742eb67b/pakotavodigewubegonulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dominica+independence+dayPDF link annotation
    • 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 17628 bytes
SHA-256: af1541476e985b1c079517851e3013ed74a0f74da4f06cb372a83cded9e422c3
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 10376 bytes
SHA-256: 0e850a1fc8a42402f7827e47418a022cc9e76189a8bcd820a3885ac70f77905e
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1