Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff778067d957806…

MALICIOUS

PDF

95.1 KB Created: 2021-07-06 14:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fda62a566aa03403a04699d252e47e6d SHA-1: b54d0fd0d21fcef10364beac92aa0d8fc3649031 SHA-256: fff778067d95780666a21c34529b93a515359931278bbe83f96326b2a9874d85
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tinavaron.com/ckfinder/userfiles/files/46434585071.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15af27e784---wilirulosavuzen.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160af98d7d5cc5---malomizosinofux.pdfIn PDF document text
    • http://centromp.it/userfiles/files/vewenalogeled.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735ffd8bd1---10053977348.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/34987720794.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c42642b42f7---77693964950.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bd76dd2a6---87681729367.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/22950342523.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pegamotewowewufutoma.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/adcc120c3dc9b122f8a5cb3d6678979b/71295241912.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733f9efdc6---48057180069.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/21579156546.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b95fdc83fb86f5422920abe26166ed26/tijeloliv.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4oitll7gcnjio33km4m4nnoal1/83063177448.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/bivazemanase.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/95865204258.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/lumonab.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/95309602103.pdfIn PDF document text
    • http://someteme.com/archivos/_20210623114348.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/24261710674.pdfIn PDF document text
    • http://minhanh.com/files/jipowalevekemafolejivomig.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fe4f6caffdf8f38c3390782b0c8f2d29/38118649343.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/zusodajapikanimuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=allegheny+county+dog+licensePDF 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_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10584 bytes
SHA-256: 79704932e8c855037a190fc571242590f885f86619eedfa33cea142a2df83f31
font_01_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 17348 bytes
SHA-256: 0a21f4bfabf2e7d9ede7b1b4bdf25dde18121d3b14c51b609470a8b6a6bed64c