Malicious PDF — malware analysis report

Static analysis result for SHA-256 753f3e1389d190ac…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 07:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1d482ea997f69dfcdbee222e68263df SHA-1: afefe0f3aa4b82f9dfea4a5f9971562ad625e07e SHA-256: 753f3e1389d190ac43ae27b7db9ba89c5bac1da27cf5d79eef16ec3515daceb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8150b7aa1d09d1fe99e4952787d17794/pebijeb.pdf In PDF document text
    • http://banphimchuot.com/userfiles/file/28255875357.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cdc458ad3---47328842559.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f610a7b126d1ab2bf2a2a535ac988aad/bumovewagorevoz.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/1273748660.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/eba64b0a1b3224a7a52c3bdab95a1d3f/84215302111.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609483dc128d7---rixaduvunotovawatudurax.pdfIn PDF document text
    • https://coluer.ir/documents/file/motexodulidatugibikuvi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sokigunusewoxukur.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/h559n7t3jdq0l92016hdnqa7g7/gikakovivimusekesap.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609036d6640cd---57092337874.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ddda786493e27e5d3ae225e22cf52439/32282669630.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/zugenazabopego.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/49104749713.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff4590fb1c---zukadigobetupiw.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xiwajopazijiduzuroralop.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/77168319430.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/nomonifewinibasuvika.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/68987550494.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c95defeaed1---gagepam.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/16504280305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=infantino+go+forward+manualPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/lubenarudemejotujumewed.pdfIn PDF document text
    • 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10536 bytes
SHA-256: 54d8c5bc3a698cc68c154a1af78df2fc38e131d2e30bb8e9a02ba43c61f5c5a9
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 18356 bytes
SHA-256: d97d1e4d0880e1ecf9c81554837075280af101aeb15677bfc32d7fb97d750926

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