Malicious PDF — malware analysis report

Static analysis result for SHA-256 84320ef401f1915c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9af43f378bdeccb3f1f7eab396c0880 SHA-1: ec971958832339ecd0de83e27fb3c0de74b898ab SHA-256: 84320ef401f1915c8e76c4c01f0cb63c4bfb511db2dddb1cf87700bc0407357b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wallsfamilyreunion.com/clients/876683/File/kuxomurikimojosimo.pdf In PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/mikivarivupa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608a031831f3d---tixavekufidas.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/1573964556.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0904be55df737ef6e425fc7a5a7cdd70/64394245601.pdfIn PDF document text
    • http://kleiberit.ru/files/file/kotixunif.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/76626545865.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/26314999067.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/69961693328.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/70051dbb03f61a417b1a39b117f79050/koxezavosumogegubufogi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5152ca6834276ff9a611a9ac2003cf9d/xazuwerowadutov.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e96d45b9---waxupisemolunakafifopopa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/11215287294.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/42031018468.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/sabigotomare.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kowokolexugej.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/waremetipunawuvokajurun.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zajilup.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad6058e41---31124980248.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/82036298974.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/woropebezow.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/wimorepi.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/24652333346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ecologia+de+poblaciones+y+comunidades+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 17788 bytes
SHA-256: 0b668a7d3420b0ecb17a86b243ded582a715dd8e065e865484189c204c8ce61a
font_01_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 11100 bytes
SHA-256: dfe4f6a7a136371df0312a46bfa80a01023854c3d2a4f5a67339884d0eb26714
font_02_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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