Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc309facea76380…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 04:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99e108332311cb97c0877c2fdb21f4ef SHA-1: c111f23a463788abba58bcc258ad5cfae7a3b5ea SHA-256: cbc309facea763808f1e3fdd2391e75f67cbbb65cbef01e167084980a997ed5a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://imagebeaute.fr/userfiles/file/folawilopomawav.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7a45a9g91hqdfqj1u1gid8j9h4/tivakisike.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fikategofovadavumunetuso.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89f4124e8---zakomiretuxomonawi.pdfIn PDF document text
    • https://ienter.bg/files/jowozuwiwirofezajam.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/fipemisofeda.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/u5qipl7n3n7d0mmerstul5iofi/96696430855.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ea71c8c3672efc4d91b069d4b1e4d629/sabajede.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/78a2bdb1eea90de107762cc617983d96/miromuxuzijelobevofikigus.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/36071770927.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/94746634184.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3c3d5f3293fae09cb9caafda18393ac4/sesovukowazugesut.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c79247635---rawezegaxubab.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/622d30bd5636798da6f311c509cf1ab2/woketunokekafixonavur.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2633436f28---57249625435.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/6388781923.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072657e8f776---pakusufewute.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/96990fd57544c949d76060440bb69aec/lavebazorurimapife.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bbfbf02817b9cc813ccd6df1d4783dd7/vawegufirofar.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f3f6o28oess9h7sikoss1li9l5/96495777519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=charles+ingalls+little+house+on+the+prairiePDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17388 bytes
SHA-256: 73ea2d0e072569de22f6efa3a65c850307d8b65228fba0bd247fcc56ae944986
font_01_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14686 10664 bytes
SHA-256: 3946efd0887b8128b9a9ac18e3d656833a7201760b2e1d1d4844de1df2ff67de