Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76c1dbdc1c521a5…

MALICIOUS

PDF

95.7 KB Created: 2021-09-03 09:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fd518fd30498995449963a97d5a1ecb SHA-1: 697d378221ace57a1ebcf36e15128a53f40af7b3 SHA-256: f76c1dbdc1c521a53b2836710cd811144c51ed8d7b36bc02a423f899a80ffaa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or scam attempt, likely to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=fibre+reinforced+concrete+pdf+download PDF link annotation
    • http://ecohort.com/userfiles/files/momobazuvebujoma.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/vagivumonege.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fopipedosu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b812828a08f86f42ac914b5a3cb3a32d/punevimigiki.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c303f99106---33009114763.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097644a2f462---bubipumuvebasuzur.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/87229654164.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4b95457f---81176710511.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889518023c6---19913593758.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gulabideremufo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xotujabazorawogedifi.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77418496041.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hq17thq52up1fm2p8j22vqqsfj/29298832464.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb27f03911---36106331158.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/89988747748.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3a50416b195bb4b78152f3fdda5ea343/xirojofurur.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/978c91ffa132482afb84abae402f5a6a/1337050217.pdfIn PDF document text
    • https://aneri12.eu/res/file/tuvobekodisi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b2df1b273260caa251efa79555accc8a/tinimepiv.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160802496c3a6e---27895563319.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/87422917726.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081348fdcb9d---daguxivotabemafupujuronu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6d0cc148---91133042469.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/72716944055.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_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 10648 bytes
SHA-256: 892260f4c76e5f61a73e66be7937e10c7414cb9bcd9216ae1175e971c1590213
font_02_sfnt_off00013c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C13 20096 bytes
SHA-256: ce70a32582aec4e41c135fdeee82b9d92af8602596fe6c3d4d23ba932ff0c681

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