Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24daa5648e406a…

MALICIOUS

PDF

128.5 KB Created: 2021-06-29 17:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a291c359df397f3b8a3c887a8b81d05e SHA-1: cb174899b426967bd9586dc6e30555c1e32118d9 SHA-256: bb24daa5648e406a742673050dd217c0fa1b967bbb67737fb5108641720cc2b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to lead users to potentially malicious content or phishing sites. No scripts were extracted, so the primary attack vector appears to be social engineering through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=causality+meaning+in+telugu PDF link annotation
    • https://iwistw.com/upload/files/radeg.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jirowozeziz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/894e2f684aa16f8137ad63d166a7c52d/nubedipovejozasozunup.pdfIn PDF document text
    • http://sam-global.ch/files/file/1347856015.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4412976c184e29381d57f6f4b027d72f/feponegafavepixotaxovo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/79824a8759e0f6039687b5096bb55a8b/11218337551.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/11585157029.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p6ts286mpanq4slhd7imoo3e9r/damiv.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/7296078207.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/39926629370.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1be2889de1---vewewawakoluxun.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/886c9105561495f534af4450b9515a28/bevole.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b953c84d7e---74392256464.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/54dac7c802486dafd758f040beabe0c5/16710879436.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tifufujedimafemovep.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/84620584582.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/7256322983.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9767496dde40bcf58438ed5c75c363c2/18789258226.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/43188763258.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/soloporanojuvi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/suresasegi.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_off00019446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19446 10476 bytes
SHA-256: 1e903fc263cffeb93fefbdf3c200ce429624bda5bd35eeb8b0acb4ff1f65e96a
font_01_sfnt_off0001ac16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C428 18632 bytes
SHA-256: 4609c772fd316ca6f275eb0bea27dcdc5c0bbfedbd78834b914488a7ebc0fb30