Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cc6cd7b6063bfd…

MALICIOUS

PDF

109.7 KB Created: 2021-06-25 19:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63e44fed7a09ff29d3dbe3bd77c06cc1 SHA-1: d035d1d56f94b338b3b660d8d7be7d5d0b3bfd64 SHA-256: 84cc6cd7b6063bfd818fa60afe10bfd045521f0d10646935f1d90aec6d7dee5b
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 links pointing to external websites, many of which appear to be hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or distribute malicious payloads. No scripts were extracted, but the overall pattern of hosting numerous links on potentially compromised infrastructure is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/885d40bc2bfc1524a0c08e1eb873d699/92613248420.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f66gj93ep52uvggjjt41ni0dus/71600195563.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078724e0ba38---68332249121.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/jupibo.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/60841071342.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cac7d73e09cd3a3b22ae382176d6265b/todekobunoniruruj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f6b905ed42719efe30e93f1a074df2b4/44453658847.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/toxalebajupagukiwu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724675bded8---dosirunobowebep.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gt16ddmn4mpcc4gr952vj86sla/zenuwokomo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/434d300b88963def3bbd90958ff3cf8f/vonobilure.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/43016453622.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/vupiw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gar6iqfhpd0uh1hhb2ih664q30/zimil.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/019c9dcf89d79a9f2cf39e031aca4988/nikoxetedugiwajasi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fjdghbopqcdtrnt20rdvha8jit/motadanazasulu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/96594100423.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ee13aae1d00bbe692cb3946195f2d119/87746479826.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3e7cfe81416732d4d544f1a688dc31de/jodajifezolitefi.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6pd3t8lfhd75k3ifgp9nvgua2/kosegakulasigunokaputi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8309c0bbca73c9fadadb88517555f928/kazewuxisos.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/zakobigelok.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609402e8467fd---sibazapulu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i3q57c5ie27ountn9v396irdrd/50847641335.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/xorajemivoto.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b27bf145b4f---zejabosutuvafirirud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=royal+knight+of+the+garterPDF 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_off00014bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD1 17428 bytes
SHA-256: c4faea53e66c272600412a7a3177c5924aa16bf3ed0c6385a888e159473824be
font_01_sfnt_off00017902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19119 10576 bytes
SHA-256: 4d6ff7830045c01f613a3c58aef8214e521e22328f02cfd356e6ed0661163fc8