Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cb2566639e33f8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9fe4f70bb0ab8b1bd607a83140fa781 SHA-1: 867076389817df2deb3f93b7449c408496f4c779 SHA-256: 55cb2566639e33f84e80c98815d9646f47fe3369b7d524000c4b5005f557d02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary attack pattern observed is the use of these links to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/897fc64f9ca5be74632e80a681be2d8e/23890531155.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88229a638---sefisenatanok.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/91618060314.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/95782107390.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xolugimatitotopadov.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/246d6f465115fc3516bb6ac0904fc70f/94165033887.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/vukizuwizobajivunof.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/62556426797.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/5412899997.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/44304019495.pdfIn PDF document text
    • http://capri.lt/userfiles/files/wivesilowagodanuzaxurugaf.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/sakamixozero.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108290730534743.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/72911763491.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///56199829703.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa338d65839---88190473747.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e81092361444d8d81a61414ec395840e/56322603902.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/getefabap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b78962d288f---99985982022.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/24537724427.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/83535354328.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/88162946619.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31999708504.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/luninojabi.pdfIn PDF document text
    • http://elma1.ru/!upload/files/vafofokilegisig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=brugada+phenocopy+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 15600 bytes
SHA-256: 2e7dec27d91f8e2ca343eed24610119705b18d4f8f27c02941770e41e3c71dcf
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 10764 bytes
SHA-256: 8b49a31b1f46548b6185d1c227989e4c031781685d78f897839c256716ec522c
font_03_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 1884 bytes
SHA-256: 1a02648605b077effbb842b083c66b0e466b44db270e1c986184627c8f77afd9

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