Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f35105d67ed26…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 04:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e698a818bfbc30591a73cdcbe75dc836 SHA-1: 59bfed29ea78a5ca9227de46b7cadb21cbc13e83 SHA-256: 171f35105d67ed267df52a6707e9cfa396de2d53e3021d6aa2c49f51743b701d
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit vulnerabilities or deliver further payloads via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rigosarchitects.gr/userfiles/file/69471919497.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/8539155450.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/lojerofuliguf.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b342acad466---92604508886.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38cf7a098878f898e9c6117f20530651/lemoli.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/31428771628.pdfIn PDF document text
    • http://popmetre.com/news/files/88091536575.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/nalotesizoremo.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/39184953761.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9cd82ce14644e15a26661543006923c8/79260753282.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/2731952321.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/8b539df9780f79bbb9b0fb6c9de84fab/60908244215.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ugodsepk5j8u4lefu8nhjknag1/xaxitofuvijokikinesu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/p99h64q043si79jr0qv57um0j1/kuxugen.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/34394132551.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86996156990.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/92a0f604dd36bff4e0336020d6b47bec/fijixejumufudixube.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/ludidaletafonatixiguliwu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/16178987647.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/41830618974.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27173404360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+fundamental+theorem+of+algebra+worksheetPDF link annotation
    • 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_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 18244 bytes
SHA-256: ccc3724e92d97a1749fe87d4800edab37f001924c390f72a2e01b1ba43cd1059
font_02_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 11092 bytes
SHA-256: 93c8cdff9d95f0b04f7d8a36da979de269eb767b821dfe4d129ed70cd862d6f9

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