Malicious PDF — malware analysis report

Static analysis result for SHA-256 966c561271072d59…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 22:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d39e43a205b1e4f798b99eb1fcc38496 SHA-1: 7b7bd5db237031a23c2148bb135d44707382229e SHA-256: 966c561271072d59318a795cf417869b38d13204ac6ee381d8df88b677f39df4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates malicious intent, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports the conclusion that this document is designed to redirect users to malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://otohondamientay.com/upload/files/lapujesogav.pdf In PDF document text
    • http://buydecor.ru/uploads/files/gedogijabazid.pdfIn PDF document text
    • https://red-adlay.com/upload/files/27632676960.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/sawin.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/zosunokezoduloba.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6eeb2fa82d45d4ebf67b062b27da53dc/pebinodaziwapezofudoz.pdfIn PDF document text
    • https://12shio1.com/contents/files/nokefutipolonobopona.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zazuxekekonubowesexelunez.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/pavalar.pdfIn PDF document text
    • https://robertbah.si/files/file/70591066563.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/zetadonifesuzomigel.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/52259304848.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/kidigepudu.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6348781243.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rurq32qh133ihqrdevsurj79s7/bovusakupinuxutefiruvaken.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/48966229180.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131a273d5f3d---53050932155.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b58b907d---dapivubo.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Kecq4O746mYf7H5O.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/67844869097.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/bilezijidewibur.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/53259844904.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/ledomivefixumoxumiban.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b577d967a---loniposo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sim+manager+app+androidPDF 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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10496 bytes
SHA-256: 16b122bf30f20d7013639c12ee93f1ac768fcebd8fff424e17ae875a71c4f375
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 18080 bytes
SHA-256: 8863c51c9439a997fc7de81d342b2cde53e5897df51c4013625e3540db1ae5e1