Malicious PDF — malware analysis report

Static analysis result for SHA-256 be797d3dc5d0a800…

MALICIOUS

PDF

72.5 KB Created: 2021-06-23 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a574ce72f84b63bb274277846ea40f2a SHA-1: d90e9a5bbb0bdbfba935c57dd89655d2dd68e848 SHA-256: be797d3dc5d0a8004687bdf88626ec84d6aad13a8e53dcc936b7d0921a704f25
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded URLs, such as http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882c79504c2---68145619492.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882c79504c2---68145619492.pdf In PDF document text
    • http://sjhrz.com/images/upload/File/33541446079.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wobuberabixizunepina.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127369356b---33353823064.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/57580635963.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d64ce2d52be1fea39947efe0cf3b087c/neruzukudovakam.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p82pa9s0e2n5ceiu28ug5agt07/2518269322.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/6826846482.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd5520cd8---27408848167.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xamumezavi.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/vezegozo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf3d0ee5ae---fupedomobod.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pemajetesukurun.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/da53a18b0df92521473200d49444f568/refadazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=video+chat+with+random+strangers+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 5412 bytes
SHA-256: 71e42e2af24c283539b42c6100e072ee30b95c7a6937dc5360698a60fda735e7
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 11204 bytes
SHA-256: ef8bde834f7dc6ac58428bae0f93c33674aca02132e8ec651e45c43f16708098

Open this report in the interactive analyzer, or submit your own file for analysis.