Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0792507b8fe7c9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ef3bf674b365d475d51017c38578098 SHA-1: 52fa43ca502ac8884728a9a8e2fcfa8fa3a15a05 SHA-256: 7f0792507b8fe7c946ad01d93fc15038b23c863b84c704e4389db430c979b667
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL distribution are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eletvital.hu/uploads/files/55704707420.pdf In PDF document text
    • http://sweepinstyle.com/userfiles/file/pefunafego.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/56958685263.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/sosenasimojemukubuzufij.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2e6b2b38de15af3623387cd8b881fb5c/92427034773.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/38831299947.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67fd7f6d2---35820792990.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/xexeluguselowibekosaxe.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/74178258896.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddac2519419---vogiwuseribudo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/40831589107.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f81ab5cc60f---91282773540.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fifupulaxaletuto.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb60064b3---83792667559.pdfIn PDF document text
    • http://chapelguild.com/images/usr/64413833065.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/43430705542.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72440f9d70c1d59e98e7dad007b03d32/bokorixipuwulanajela.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/37359656959.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/10341073804.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/xodogowopofiba.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/71721335094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+to+powerpoint+2013+free+onlinePDF 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 17308 bytes
SHA-256: 3f1bb1a8b776824fe1183eb4d416509871fb7725989bf975fdb74f59377aa0d4
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10808 bytes
SHA-256: 0f205242e5c76eb919403cefbdce1f3e2fded6cd8c98f963c5c8fb01c4df841c
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1