Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e7cf3fc196788…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 00:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f5b4eaea6f4f56de2fcfc06a0691939 SHA-1: 4dca52a6faf98f971b64433d6b01ad679248e903 SHA-256: 3f3e7cf3fc196788ba5ad45badb1d723510876f658e18de2cd8017f581958a6b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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
  • 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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/b8fbkhhd10okg8cl3noptpauim/nukegomirisubibepo.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c49c14e6---97910528330.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610796be15574---39359899644.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/14719815678.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/90910852925.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/wojubivujutajukexepalimuv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160f48efed67c4---3054818298.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611883b8c2e3f---pigavabetulo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c674b0e4900f0887d761e18e40a8b0af/93498914972.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962faf3420---92029279871.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bijifeduduzanorevukudul.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6e484a9---4627639202.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/14948468029.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kubewavasemisujuviv.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2c8v76ii3dbpqqh5e0fr62okbo/52191059406.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/farunikafigalexi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/ximup.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160821f4bb70f6---43275831858.pdfIn PDF document text
    • http://sro52.ru/uploads/files/13001832773.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/60977360332.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/zodudojekuxumimixifun.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/xamarodo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/zevasa.pdfIn PDF document text
    • https://okazionche.com/files/bosepubifagozap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=value+stream+mapping+karen+martin+pdf+download+freePDF 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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 11088 bytes
SHA-256: 7410d11eef44fe4521f24e8338d33fa26986c24a3baccff65d2b9d40fad41d65
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 17976 bytes
SHA-256: 36f253286b89c58acd58d9b35d660e2e5c7790c608b4ea120e96b5173a7ae6fd

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