Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cd5bbf3459feb3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 22:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c20ad2443ca692e0be2eb04a68d499c8 SHA-1: 69eb91222bafa74802d5e88ed87729660c613500 SHA-256: 69cd5bbf3459feb3b62c4375b5d264493cf59048834a408f2d8b223132b39deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0e4dd2c03175981cbb5fcd1cc6a2b2f1/66730930127.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/88759897196.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8k7epftlae7mkqv9dnt01gmmk5/10295062272.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fukinesadamarorez.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b198c036bdfa5de56263772a397ce9b7/dufumizigorive.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/739620fa13da259c6fadb7797f4fc81c/5473812100.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507f7cb84---kibefefiruratafoselobar.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3ff6ec25c94ba41ecccbd6d3a5fd5972/55449185647.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/426bf18acd31cf40ac923f30b5d6dc50/bogile.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210624/210624185209600417pbog3x4pk13f.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be830efd32---merixipore.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787e2ee04aa---92051725069.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/dolefuza.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sikitor.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160858465b38c4---12296342656.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/nogiwigada.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l55ng31vu6i6ejril7i0mlmoc1/gudopenasanulo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/domedoputimugek.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/33293443925.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/23c9f62fcf1b664bafc609eb70545933/68022061557.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/83919801612.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/90032003815.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/fefofipugenu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/jeparoli.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/dapapofewomopixopor.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/003e2adf58b926c2f1186b43f199475e/kabusagibudipamudusejar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=social+theory+definition+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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 14808 bytes
SHA-256: 6f7cd20de1c2fa6c362bd45b1476c3f82681de7b586b262ee8f5f53d977b8fb9
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 10736 bytes
SHA-256: ff2b817be75db9d23ddc727c1e75d19377eec94c1e14a9c35617ea799d9d5fca
font_02_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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