Malicious PDF — malware analysis report

Static analysis result for SHA-256 5091dce556642a50…

MALICIOUS

PDF

76.2 KB Created: 2021-06-13 23:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 165eef79c6fe9fa87a7d0826951a5f2e SHA-1: ec8b4d8280ec20ca7f69858a0cf21f8a5181a687 SHA-256: 5091dce556642a5084da88140dc7b776679e8b97777a843120dcbae9f38c07ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body, though partially garbled, includes terms related to movie downloads, indicating a social engineering pretext. The presence of multiple PDF link farm heuristics further supports the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=allu+arjun+new+movie+download+2020 PDF link annotation
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xipodi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qvc8r4jguak3cmfccsui23bolr/67139583786.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/sewivomatifuwonu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c787a5a1cc840c2fa1eb8b62b5d0db00/wosuzowijesinubogil.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ccdd602d842428a6261f61860b4cd7d9/7389010297.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/88976527806.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0809e0042---jebinumuwoxulaginujefi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075e54504---55264916408.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/boe1phjdi5j9k4bo0sn17091gm/sarubixitejakinusu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/22860933077.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t9dnu28k0qt5akkm5dq2boh8a6/97930884682.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/45350710977.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/bhlpp27ogj13flopbs27gf7rkv/tubiwusovexunapesuwux.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos/%5C/55872551084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 5284 bytes
SHA-256: 1b474ebd429c9b39436525ca81283b49f3b1f07a7ee48eb04dc8a0b62912afa4
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10788 bytes
SHA-256: 33593004ea3c29f2aed532ce5e2519b3d742fa3232062eee4659d0e5c6775f05

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