Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c420ec924e8f1b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 01:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc716094acd1d53e176a12756bc79c95 SHA-1: b57cc6c297e24df7ada6476b36b3227108001a42 SHA-256: b0c420ec924e8f1b3d784f2c4da649cf0ea1d4af27b0348be700df716eec6adc
156 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 or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://preserveproperties.com/userfiles/files/sodofebe.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111c49371fc1---wudiradupoluw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7c62f6823e3340258602ffecbc24cecc/48018423387.pdfIn PDF document text
    • http://uco-kampen.com/media/files/78271552073.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/46222185015.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e8f1419f---62154197590.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/volej.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/58920008614.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/881cbeeca21f9e598038e1605aed9e30/dezotonokaladegudegika.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725633aec3a---xejosoxedefopif.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/9287619168.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079950e819cf---pawebazisaxad.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebcc3f29fdfb693131bd86bced9823da/sadifenajazemapiv.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/liwisusamo.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/66848093661.pdfIn PDF document text
    • http://k1a.ru/images/files/file/vatuvikilizevupe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zetilenekipa.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/bubesu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/12156197f232d4b45145c956d8f08cd0/pofinem.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/nawoxatudabizakisowe.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tefegakegaw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/66d8e286e95a023185da09b695291f45/78185039583.pdfIn PDF document text
    • http://vaynhe.com/upload/files/pifududebufajibuwovuzi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff1f5a2928c08229e9418edd9a61fb11/dirijurate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=skin+cancer+journal+pdfPDF 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_off0000c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 10744 bytes
SHA-256: 169c3ce735b1ac415e7001c2ceb2fb8ecdb26df34f2aae28d002c3177d3ea2a7
font_01_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 15596 bytes
SHA-256: f9aed0c3c44c7b780de3306d90472699843634efeb254fd3929968338a00c177
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1