Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5000c5e1fef23…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 17:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e4610743c15a4cc40e3448801dfa3ac9 SHA-1: bcc656ccffde8b2af494b32f05b69c36ff4d277b SHA-256: bfe5000c5e1fef238927fcf9c74490222522c0630fc34d8e6b7a9ad36329065d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous links pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs form a link farm, likely intended to redirect users to download malicious content, possibly exploiting the 'formcraft' plugin on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://eperon-kochersberg.com/img_db/kepigebibezegawidasupoj.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e309d152cf5---27823751085.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc316e5c36---20885902671.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092be154c586---12484879643.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d900007ee12---zezopupisolelosovegi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a7486cd1e49365ad507c70088dad8379/41470114466.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cda5e45c---nizixadaz.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/fomep.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3529e34205eea8192c429cc5fd7e0c82/80263110206.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1818f639db---pulatiduvokarafebezosu.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/68322625389.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/ranirugasiruga.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/63eae5d2b27b46f3bf72ed005dfdba5c/pidixedej.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/6729901904.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719252754f---62652193219.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/99908333569.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87a033d55---sofobalamawi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/63916139988.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gudafelip.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/96638852353.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fba519641b63afea965b49fd8719c26c/likominurasapusu.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54030746499.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/86088904910.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/55882778715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+minecraft+pocket+edition+on+macPDF 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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 17948 bytes
SHA-256: 3b9ba9c955e88154f40d7aba1eff2678220d20fd7cff2744fab21cfa530b0caf
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10920 bytes
SHA-256: 0743fbac3fbdd082d4baf62e84a7d1c1f91b8a84d2f8e2ff8fc36a162b2339e5