Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06464c96ff55ee8…

MALICIOUS

PDF

86.8 KB Created: 2021-08-31 22:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fe69a72dfa535237eb5574d94b10e574 SHA-1: 1bbcf16a5ae38941541a754f11106441208eb838 SHA-256: a06464c96ff55ee818ba88fa3887ed4f00504a2d65ded2bbb114a9d4aa47ef89
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure indicate a malicious intent to lead users to potentially harmful sites.

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 http://parfumkin.ru/files/files/42257072087.pdf In PDF document text
    • https://webmenuplus.com/images/file/71876751456.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafdf2e664---67347702668.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082893d324b1---zubafexupufupewoz.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/jakopobop.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/vokoxoratozatelelo.pdfIn PDF document text
    • http://gptools.net/userfiles/file/78057802139.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jidexej.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/busezakevibediregunak.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8131725b8b5591d921a249d1a13871c6/xadugakujeludinipaket.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/39837164069.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/tiniboxotibuxowojeleti.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/gevab.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/vimige.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/76012852172.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/27125256819.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/af0bf05ad4ea4b8809090647c49cc52b/ribotazikuki.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86570c660---76724485281.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6d54bec15---36618919639.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1bfea8d1---57859902026.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/61476384601.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/jibatodaluxamegupugepi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870ab34e3bf---vomigisowuxuvoriremewujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=informational+text+language+craft+and+structurePDF 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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 18736 bytes
SHA-256: 29779b2268531ce89bf12836a424f9fac802e7564c1758fcff0e5f27ca519482
font_02_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10972 bytes
SHA-256: 6de16b363f850ef15bbb04971dca0fdc7dca6c341c9cfbb572ad0d318138ee42