Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d5f737346e7d6a…

MALICIOUS

PDF

91.3 KB Created: 2021-08-26 06:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32ef88884561d2df17f6ab5ee63ed2c9 SHA-1: c7c62eb3e56745a77b14ac634e3cc99b7cb46547 SHA-256: 18d5f737346e7d6a8eb8fe4278e508353641472767305ca8b57fce9366e66c04
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to phishing sites or download further malware, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4uc60tfgkiidsdgvhpljqsa14h/wetil.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c814ba15c8334c8003abea8e37504415/11178788186.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6bf552d0dd3d9c88ac9818ae03864962/jatoxeta.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/61953918929.pdfIn PDF document text
    • http://funperm.ru/content/file/63074840604.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/2929599350.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/metutinudenavodefor.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607646cd2c885---zitofexes.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/32660443039.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tfirg3vkvgidie4h2bq0ifilk1/rakuvapesudekakato.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f78a1fd5---17895706874.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/qtpd41m7v11gddbte8s7l8b5ue/83439124175.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18b220112---73971221034.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/85819476144.pdfIn PDF document text
    • https://aneri12.eu/res/file/8521954790.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/zeloxefizum.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3343a029e---30184979888.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b580a1906086798ae1e7ac96c7e3a1b1/lepuripaboxe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f87e1e071---nadizamakutili.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/ponidozajatole.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/manobamutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bi+party+systemPDF 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_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10312 bytes
SHA-256: d5e55a8bc41b7c695003d0bf712a456111556c3e93c9449fec82a8f32e9fec9e
font_01_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 16300 bytes
SHA-256: 196232c14cb31977f66e73e28ff98e3c8176d6f447a8011355fd6302d6f06da9

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