Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad5be88885ad91…

MALICIOUS

PDF

82.9 KB Created: 2021-07-28 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc5c430150b56acb353ebb267d8cdda9 SHA-1: 44d9437c8af3f5ae28ce405c70ef41971834269f SHA-256: f5ad5be88885ad91e6b005edaaf67b862abb4a7bfff69b63ebc733b4cb36ed01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e532cabe---49301121226.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m6qqnn1t666cho4bi52e7k05q3/jujuduvinelapasud.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fa53152a---pezesebabim.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lipegokejisasanug.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b515efc8996---xerasuveb.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba1f075b9---68899793256.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ceuros8ao7d5u4hs7hqecksur1/pazodop.pdf
    • http://christopherspubandgrille.com/userfiles/files/lijobus.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gmla4o2ljm0qu1081jjacah6e4/13466490169.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/fajaxib.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/15vn3lvr1mjq2dfnlnjuk41f1b/sepenepad.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6c9cb45dbcefa46063a206a7ff0075e/nelonu.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/xedisepifajudimiforir.pdf
    • https://ecotranslation.ca/upload/editor/file/26204929741.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc81e55e0---41348374948.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7a59061e---821611068.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rvub3kcj7gmb7mag0nf0vbmpm5/nuronagoze.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3b37d599193c31ac343cdb6a3833aa81/20786290664.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d241b31b23---54844105484.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j59qp828svf55v8nv99a86va95/bofelolunofemuwegefes.pdf
    • http://highendschmiede.de/highendfiles/file/guninumitipova.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/32dc94dfdc201d498c60cb097be7094b/suzudovujevigax.pdf
    • http://purofirstli.com/userfiles/files/fitavofigelirolebol.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb34018ff5---98167540772.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mine+imator+download+32+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b4.bin
469cf65d80c24bfc7ed4ca1468c1716c967d741878f86043d5773c4e74a62cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 17468 bytes
font_01_sfnt_off0000ff00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
font_02_sfnt_off00011717.bin
3ee9832bc16c2dbd06e9559fc8f311cbc0014666e9b252f6808fe801a1240aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 10752 bytes
font_03_sfnt_off00012fe3.bin
a3df66c94ffb73a563d0c0252714c36d976fdb3cecffaa1c32d9debf585f9841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 3072 bytes

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