Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4a4d016cfe62c0…

MALICIOUS

PDF

93.7 KB Created: 2021-07-19 01:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 12b7cd2e68b2c7cf738a9963cfea90a2 SHA-1: 90a47a42d48dbc1d13df1cd65cf63b9359bf1b45 SHA-256: bf4a4d016cfe62c0023cc66b9ca8ced905a43197d11c1e66d5b40d98a843f827
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting it's used to host or redirect to malicious content. While no scripts were directly extracted, the nature of the links implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a69c248021436cc28f57ad7e7e083f8/sunujamemokiligudil.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c439ca0d2ba---42209232219.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6d80ba5bf50e01a23d99750b2b78cfb1/veruvit.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/099de2d80d9f1f3727afa74be344aa68/bopawonapotusasaf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd311c04c---14411646951.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608749e9a0c32---43230187864.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/92d79a50c4c3381f1a6fdf5dd19453dc/dobojijekiresa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d360304444189b2fdf9b16d0b4fcd790/4154703309.pdfIn PDF document text
    • http://mousike.it/img_ins/files/52491548644.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd454a73fdd2a3b40c296b9709cf6c81/30808723841.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a21b666b---98036117280.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lesipadazuxavudovepib.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/42783526813.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cd1cda87c025395173679cccfe9f566e/84319702300.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/63760228064.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/wakutepenazod.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/detakixobumos.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9114ca1---33156894815.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4d6a9d2dc3f593db249d9e2f4de317cb/vepapurotazigop.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/62814560416.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/m8ujh3b93u1c67u4js1gerimie/murizewaj.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bopetelesebobakexojuxunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+relation+to+me+is+my+cousins+daughterPDF 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_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 11024 bytes
SHA-256: 7c9ea0b90565cd5676027327548d361f834102a5b92856d5fce41fc93733bd20
font_01_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 17544 bytes
SHA-256: 4e98bf727a7d67b66bc7bc5ca062fd40f04e63d4b26b6c1ea679e582c962b7ea
font_02_sfnt_off00014f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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