Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dfeb0e9018701a…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 22:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8b311dbf1dc0180321b9a33e0e99f36 SHA-1: 2d0ee9d383f2f620c3cbb7a518a6c0d5873b8602 SHA-256: b5dfeb0e9018701a027ff6e019af61309f4e6d9c1229ca8dfd3e939449d686d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=brains+blown+out PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e54e890dd---57774641668.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/aa34f01a07a5c55808640862da11af14/18295239729.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/78498941198.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/45912194252.pdfIn PDF document text
    • https://jobtiara.com/files/files/nevapoziluxufusiv.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tivazodinox.pdfIn PDF document text
    • http://isvpro.com/custom/files/43161195476.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/91fa5ac59f8456d799d39c6df9d6f053/51467452803.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4d4d8a3f---gelawonised.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/4658180089.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ea2a3f067dd5def47fac2e9732bd41ca/wavuzubovagukewijux.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53740e8840---78829257706.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/aefb17da42f83cd1099a5a6ce9a02352/zigezosozixixuxiniluxu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4bd3e639144e20f7802a477034ba6f32/vosalosogujofiwebuman.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/607eabd73dab17091ec8cfa90e57fe96/95881930247.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p4051bsufd9dnuijhrfqlkmj3h/wibupori.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0be5e9d56731d56da929c7e5f0eda579/5786572519.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/laseza.pdfIn PDF document text
    • https://ocw.tw/uploads/files/65346658286.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f2873003740b97687465bfdcb21f9bf0/16309382881.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/58384548454.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1677023ec---38949514774.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/36807408774.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3knnucj4ogcns9bu6e2jc3nrit/36172459775.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3338c53be---bowazokef.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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 10348 bytes
SHA-256: 3f1946ca8dbc468a838a3ee97d20d4b63c42a699763407e5c425279056e033d2
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 18844 bytes
SHA-256: beeafef3deb2983528b9a2ebff06b7ee4cf708160192a6f68e62fd5c7c41145c
font_02_sfnt_off00013e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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