Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a1dfb6405d6b72…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 04:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c5de7cd8d5b351b2f72b2aa55aedf0b SHA-1: b8e48176e94279e097393ee231e3e2b5791e254c SHA-256: 68a1dfb6405d6b72dbc01197dd8379cb8f6b445c11e668ce0dd176d7b7b683fc
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely serving as a distribution point for phishing or malware. The embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=muestreo+aleatorio+simple+ejemplos+sencillos+pdf PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a9eebf9c2513b11c76df1f908cc6b57a/15323501231.pdfIn PDF document text
    • https://digireg.lu/upload/zalupijowosolakim.pdfIn PDF document text
    • https://topupdana.com/contents/files/zemedosefusisibabajanukag.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/sefajowinegugejile.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a17c8de81444c979f25f96c71e62fc11/93831811190.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/36c97b4a8faa693f01827c8a349592d1/89267003818.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/28972805902.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a0067f2e---24052021246.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070445360e61---neragefakabefusux.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818d29bb8b8---fofizezoxuxizeku.pdfPDF link annotation
    • http://workcoop.org/fckeditor/userimages/file/20210715191355.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/90637674370.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gofakoriwowi.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zaganepitupoxufidas.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7475a1fd22631307b5276358e1a08107/tanixitukebonusupanur.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b658bd6d6ce---tomopodelepixavob.pdfIn PDF document text
    • https://limsurdua.com/contents/files/43809108105.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/34131273957.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5185041cc---gafeduzumezapifepomewovit.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/30720358035.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/13925868300.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b8f8f779d3dcad0391f66033bf8cd409/bevujofo.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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 17020 bytes
SHA-256: f251e74f2aeb3e65a6f5e8ee4ad9ab26e6e07e4a50d5c0e7d5175d0e5f584d91
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 11004 bytes
SHA-256: bd2987cd85b1ffee9f4897263576fd857738f1776064177abe699e825c7f4f33

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