Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc048b7ce106b65b…

MALICIOUS

PDF

99.4 KB Created: 2021-08-09 10:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9370d8a5f0b488e8acb2d267a754b350 SHA-1: bc54e9f36019fbe4decdb56d8dbabb9721106bf7 SHA-256: bc048b7ce106b65b6781f10418240c55257e06daab96bfba27fc6bc3660a20e2
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9540d9cf---62255004689.pdf In PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/biliwipusivagi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/32249265867.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/nuturonutudufukalalili.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vakujuresofedijonako.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vini8kojcci4h460kaovvo177a/vumadi.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/sijijojakagigewami.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/31527331075.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/62759033025.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d13ff84a9894215e9888e9ea38b8c581/38652218618.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b797e4baa13---40446619273.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zapes.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pnccf02a06a7506tuj0129t3r0/wasumolotifidu.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/totalipebaxixukazi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5j3lpharu8rqsci521sq3shve7/vobutofamojemimagemumi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/79474312663.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3192a0308412848709c05d0578e5c81f/forujul.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d7d712207---32909702930.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b86c19b01---15806095057.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/31039966020.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4oi85b3f48htk2qjj2pit5k6k0/juvogenopikadeninepo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098971b79d8b---jenaxodema.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3vh111fnfdtlirjo3r9jf09a4k/7771322063.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/6951010388.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/46156f3f6677b50be0637fbd11cd556f/60852039763.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/def1d13934f15be61752e7f8ed0abcc4/juzotikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+different+types+of+springs+used+in+suspension+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16824 bytes
SHA-256: 90d77834361ea0ee4e57db4d4b5cb1b8734b1a4d42828d095b39be988013d92f
font_01_sfnt_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off00014c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1C 11104 bytes
SHA-256: 90ee062002e1ac511ed75be123020e5c3e4cae61ba1c87fcd4cc3cb1f92360df
font_03_sfnt_off000165aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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