Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6058b03e2a2963…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 06:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d5e5411d700ae65d2ee51ba0cca068a SHA-1: 3eec5fc3f6b0ec8c4c0f7c749e1b972ff612bd26 SHA-256: 6a6058b03e2a2963a7d4c0fa9f075a5f4872f49ca4235bd48c2e54eda600736d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with external URIs pointing to potentially compromised WordPress upload storage and other domains. The presence of numerous URLs suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=cinema+hd+movie+download+firestick PDF link annotation
    • http://chieucoingason.vn/files/fatenulatav.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vekokowizilepozojeredekes.pdfIn PDF document text
    • https://intersat.lv/files/file/96154879717.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/dumerakupagoloxe.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kefiwozaver.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/navew.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lonebetoximidexokuzan.pdfIn PDF document text
    • http://att-na.com/upload/mazido.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/91210871621.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wenisajobu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161363b4d1601e---wudowibosikibeze.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/81051252209.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4e1e1a77---26486335505.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6103728694.pdfIn PDF document text
    • https://bdata.vn/upload/files/dulovivukazudozit.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uaavj279e3km9mmcd15d2d5q24/kamugovotavuwunaba.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/17089407690.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ebb4b8790221019d0537e49d1c4424e/89183894791.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wulomobax.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pivikabirudixitanapumu.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/divewasokexul.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/jezajimunawor.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/sakoruvamam.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/vijirota.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/kebufaxapamigepafo.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 11016 bytes
SHA-256: aa1d249c39fa49becccdb7af2b4c78368829bcb302bcc3d015d168e3d0543fe8
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 17516 bytes
SHA-256: a9b908f6d099308c9aba39fa5a532b5080d1067d6141fcca01a9799f80058e28

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