Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628a2114af86b90…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 13:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cdf71130f995af9546a76533cd1a4bd SHA-1: 8e6fed88293e2d5151166657446b8aead0b9dffa SHA-256: 1628a2114af86b90335ce80b0d1d4b3f2000f72eb95f628d8e28321b02b25678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://coretry.ru/uplcv?utm_term=diagonal+sudoku+9x9+pdf PDF link annotation
    • http://allprintusa.com/admin/images/file/jigasizujidawujuradaji.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/nijajazetezu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6ef6eb8c583001338d43e017af3ad5c9/20749182357.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f27e52f678cab55a8080639a8507aaac/vuxokodakazomakexixamoni.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa155b0c98e---48730332234.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3f81c36ae21ecad282bbdd1d080255d0/6872601694.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/164ade38a9c85e0fc89c58cb14e62b5f/fuborivenux.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/61051789964.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607100fde046a---vutepagugobezevapevezami.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vsu6urh14qn8gqqpoi66taivjv/28096723028.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607306dc49ec2---sejixijadunefifewutenez.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/97409123408.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/71745873710.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/pebifolotatuvazuni.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/29436807797.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae291af44---vaferakederojob.pdfIn PDF document text
    • http://novena99.com/uploads/files/202108150541305409.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/38035204557.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/02fd6e386192a9b66adbe9db554b4fa8/levinitibavotubebesorix.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/21498475653.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f9e1d1bb---70245027698.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af648392f7.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/56745840142.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/vakiwoxo.pdfIn PDF document text
    • http://kudusde.org/resimler/files/lipilafuvolejosilusuwup.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829afc1e744---ganamuwugozekawejizewel.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_off0000c115.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC115 16792 bytes
font_01_sfnt_off0000d92c.bin
bf9567ad2b97bb09874ba66fe41a3d0791a32d573eeb7a27aac5a026bd4a2e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 10804 bytes
font_02_sfnt_off0000f1f6.bin
687b31d59b6fa260c553a8d05f67a93db7555753c5de3939b13a7e647d31218f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 17804 bytes

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