Malicious PDF — malware analysis report

Static analysis result for SHA-256 80be88f74a73bd54…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 06:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee283f57fb12a298dd7f27300af44537 SHA-1: 6225125734ac662f84b87ea1f41b89f4bc320b2c SHA-256: 80be88f74a73bd546d43c53036d8da17d1df7658161b5515d746fa3a721fa812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=integrales+trigonometricas+tabla+pdf PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a77d79fa---87171283922.pdfIn PDF document text
    • http://apismorava.eu/docs/zimasabowavefonanoka.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7b75jaj8einupjbi37nfjf4771/3673613856.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/lisedukojatapabax.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/sekixufixo.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/69995599840.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/padegaparaf.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/18629841511.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/37444641803.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/13367595712.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/29051368617.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/vufalizi.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/h6ct99047ikr56cpi1p9ae0b9c/65382524853.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l5vulr840jvnd3vcve8o9jj1kd/pidadabimesaw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fa0ba7ee6926e7410042bae0d8cde9d5/14039033305.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/gipefoxopolanabire.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gumafaxu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/53064761211.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/73129946900.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/d9b8e8dv74sraens95k20ee2i7/65583232847.pdfIn PDF document text
    • http://strahyi.ru/images/file/xesitopesinuriw.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f8e1799e2f694247c214e96476abd29f/25233738029.pdfIn PDF document text
    • http://lucann.com/Upload/file/60378498981.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e1112767---6190743715.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 21668 bytes
SHA-256: 75a2126f10747944c0b06217d3cf268d3c5daa451dcbfa599d5b8073429df2bf
font_02_sfnt_off0001408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 11052 bytes
SHA-256: f2a3ff3883c89cec3b4ca3caac4a2f286292b330c4a91153ec7492400bb9484d

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