Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce9d1146bc40373…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 18:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7c89979dac295e0c99cdbb8eaa46b13 SHA-1: 3e4521c85724711ebf5be91b21709e2d7545d198 SHA-256: cce9d1146bc403730d32976b50b5659cecbd91fcd2d54059445f3ffd0cd74c5c
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and other PDF files. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm on disposable or compromised hosting. This suggests the document is designed to lure users to malicious content, likely as part of a phishing or malware distribution campaign.

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 https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5608bf07---pamevasajemigikufid.pdf In PDF document text
    • http://fxmeat.com/upload/file/e6659b5c43e2840352b1c545c8b13708.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1c1c36abf630e01a52420874c8189b8f/24402257010.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dpjbu194m2dk9uaqogtklk019r/99714275914.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7b9bca3e---48677331603.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ditekukuvigugunafudab.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/75093199802.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/viwowida.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607890a7cc633---24321339938.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/75124681674.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mimazetidu.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/86376128353.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/60729964755.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/500004edd73ebb38ed0ff245e9ab6997/58002580938.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609badb6256a2---ziboranomunolafagorege.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e5aacdadab73eec76d7289510836592b/36102404834.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/143259aafaafea3ea296dcb056c5530f/dojegati.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/kimomakuvi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01bb1ca14---lubimoxarop.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/kepuwokefagogovudu.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/jafenuvopebige.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778aac2f73---67280618315.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/bijofukidunilewesif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shipwrecked+vbs+castaway+logbook+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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 11368 bytes
SHA-256: a8bc98105242a6936867d8e8ddc19381629e41b879f05a0d603b8398b004ee73
font_02_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16648 bytes
SHA-256: 49fd8406f68203ccf158de8155d9ab373b3f1ffda87071817c9660f4ea2e3a32