Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c24a58982d2cf…

MALICIOUS

PDF

72.7 KB Created: 2021-07-15 14:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8f5b6add554404405e808b5e455bbfe SHA-1: a5f54327f66ea2da7ac37521b58c6e61a1cdf589 SHA-256: ae7c24a58982d2cf1c15519e4016ccf39e3cfd7b6029b42a8ed8d885850aea6b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://essiac.cz/UserFiles/file/47630877195.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f860c9d12591ace6362b299e97281a52/movifoz.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vizuzoxekizisazowunutiwo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9a51ab64---sagogifararemivewede.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/10573481592.pdfIn PDF document text
    • https://asiahijau.com/contents//files/fukimugud.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/66958511057.pdfIn PDF document text
    • http://heureka-cz.eu/files/wadijo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/79757280345.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b217e57835---54537093862.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/82184197749.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/13e60360b206f0623b58b8ca79981dee/lexapetinipiwokitivim.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/11732475290.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/72887846678.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2ac85e9a1fa7a9a6cacb4b5a134914bb/58893440930.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xoteselabigunapuvutisep.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab9e6703b---rezonezujetujodikano.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f3d41262a9841c2df567e32e885f9889/biteben.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6be2ddf1f---47399381483.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/jidesitizoxila.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/39545280659.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee93d1801dd---25166398654.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/2262669020.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/223359dae7baef88598f77fc17b97b71/bomelabupavogexijorizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=linear+equations+review+worksheetPDF 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_off0000be5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5B 15296 bytes
SHA-256: 683a4e64bc0f995ba1d77caf06f0e560bdcfd367699b88df565aee90ebfcab10
font_01_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 10604 bytes
SHA-256: 9a50c15ce4be4e14843986061c3eac904dd03a4356af6e22be95a46b5b9422ae
font_02_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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