Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b806071ea355c9f…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 15:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34e5f0d30a3381d3af818352baa23559 SHA-1: 3a4724741d69b40ef490848ee271af1c0957c0a6 SHA-256: 1b806071ea355c9fb51753a72dc5084b2c20bd92b7233a05bb70443a192b8fa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure the true malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://geneolock.com/locktactyuma/userfiles/file/sixowef.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ijs5v4r6robs26l8o0b7ajnrcu/sebafoliravujefutolipa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9b6e89c9---nefufasapuvijimesarinujo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0cef61d3b---83331085869.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bd47c8f244bfccbd14d4d859132a9017/tilenopegeta.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e2922f421e37a8f11c1476ca14cf4ff1/fegolew.pdfIn PDF document text
    • https://koratspring.com/upload/file/34437557677.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/rujular.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rukalavefadexigofubogiwu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0893efc1da38ac91d7f2a4933e1eb3bc/48098799981.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/6886613192.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e5377f7673c8aef2cba611b17673faff/totimowatijemapegide.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/defasefoja.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/287d4e933986fe51302d1e2f00410d64/xefufovetofevijavig.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/23784674896.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/figojopamibaparijomos.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-29/20210629085340673253.pdfIn PDF document text
    • http://armanetti.com/images/bodepazugivosemebodiva.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/48207307900.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c41f0e9---86122800550.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/782a6fda153df773c1cdd3a56063c08c/kefelafip.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/94420688883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+find+out+if+i+will+get+a+full+state+pensionPDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 10748 bytes
SHA-256: 8ede98b23058ba984ab30f5790a15885d5823923974be684ea74d734eaba9971
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16440 bytes
SHA-256: 4e494cbe218a16eb3f7bfe7eb100b8c9186796af19c81f2e8b21672014d8b212
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1