Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7ef44ce1850ae2…

MALICIOUS

PDF

86.9 KB Created: 2021-07-17 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5112962fea151b9f68827b03d85caed SHA-1: ddf2bdeb9d0534bad5042074220a2d7d0f592169 SHA-256: 8f7ef44ce1850ae2c0e7e0d5b41a547304b714aecc229e6663b9cff51c17c9a3
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to lure users to these external resources. The presence of multiple PDF link farm indicators and compromised CMS uploads points towards a campaign distributing malicious content or performing SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b348dfc2f2b---wijunokukilituvurirakel.pdf In PDF document text
    • http://dansecyr.ca/pdf/file/15685806950.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8c2630a---82504756721.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/ratenonefesomevolibav.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/oric3p3s4bjcuaa0bb3mhivdud/38690589043.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d190c6b22---4533967068.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e6ca925a140ecd3ea526e2ecbe57191/rorusugedaja.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/prq130b12jh4q8nl0dg1b8j1n4/puguwaf.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/2309836267.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/338591628.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0405157d---19338390237.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/68731454921.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/bowep.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/82253131047.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083385ecb122---wibojajexo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/42910623713.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f24bd9b82bb3c94d6673b959f29fb8ef/81145230144.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c94f09---vitiluwolifi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf56f98b15c---pagadap.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/81cf1e9824ee1d967ad517a099b25416/96932160553.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9777809f---poxosotipidudir.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vogebivage.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ae68d4b531e0c6bf9e0eae9f01261b3/16663486250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=blended+learning+in+action+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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 18672 bytes
SHA-256: ea70ae255092b4490484de15f01ab03aa9ea5ed66ee577a940ddbf48434c29f3
font_01_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 10680 bytes
SHA-256: 0215fd0e63a83f1c22ddcdf6f79ef34ea741933e3c158b1d03c972bd7c122420

Open this report in the interactive analyzer, or submit your own file for analysis.