Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ab6cdae5297f2…

MALICIOUS

PDF

72.9 KB Created: 2021-08-28 03:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d46daaa0dad7c726b8e9774d8f9fa0c2 SHA-1: 4760e8b067a93aaeee718172f8444bbfbb4f5a86 SHA-256: 829ab6cdae5297f2b679b50ea721e79ba3f3b1641261d2fc283fbcde8796ceb9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating 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 embedded links suggests an attempt to deliver a second-stage payload or phish for credentials.

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://garglob.ru/uplcv?utm_term=oxygen+is+more+reactive+than+nitrogen PDF link annotation
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/895cdb06b507b00bb2b401cf3c5420fe/22564950143.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/lememesijazefebewote.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed44574a---kigotipojidejop.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kubewav.pdfIn PDF document text
    • https://hojoairport.com/images/file/zogurovabawimizotasagegi.pdfIn PDF document text
    • https://irantruck.ir/data/file/15639081611.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd80e6021---18472474530.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/33773108158.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/pojemu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da83327e9---97918898329.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a445f89888---lamesuzipafadiruvovurukom.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/55802016269.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a807bfb0e7a---zavakanazemesirobuso.pdfIn PDF document text
    • https://mfdesign.hu/files/file/powukepijipufinedipatajox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de42aec9427---83550153924.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lekufodujufujepumonumapiw.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/kilupapeguwozenosutikezo.pdfIn PDF document text
    • https://aashianarealty.com/file/69794546778.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24096740577.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48530c70d62bfb788d9b53eea8f828aa/bogupega.pdfIn PDF document text
    • 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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 16044 bytes
SHA-256: e4f048fba352fc0f9cca60ffe6286a08825cdb047e4030c0940fee2af5611583
font_02_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10940 bytes
SHA-256: d16f6ab5c3110f7b9c303d8e0ee437b0fc3ccad0b8ca2dc1e0e9e7a12135ed62