Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc533db2179b24b3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 21:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f9115c38eba52ae550f22375e7510a6 SHA-1: b642fa0153b0d86c7c2f18d3c4742dc0800ba13d SHA-256: fc533db2179b24b3ad11fbff6dd8972a758af230fc9edfe6e853ffc6ec1fb558
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL distribution are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=experimental+design+in+clinical+trials+pdf PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5bf971ecafc473b62e27eeea3b62521c/bowuzezabobojagu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/23012119602.pdfIn PDF document text
    • http://congtyvima.com/images/Download/meduje.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105510e0627a---95170345681.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/65158476453.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/17074738441.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9526beec---89900973358.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f21fc5b0a---82095356954.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/wowetakajenexujot.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/84809852354.pdfIn PDF document text
    • http://muszempilla.com/files/file/ramuzoxugizu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/emidq4ugbfr4ctn1or63c7bua8/82112628742.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090edb92747c---96428611599.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/wuvesapafum.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/suxizuwiwesuxat.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/fepivavoja.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/40223228150.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/67057835478.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/58f0b23c3f4019e9e9c92a15c899c1b2/sobilaluros.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160750788aee46---92966724395.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/84823442612.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16072c230f1dd0---pemovurababovenizejowexav.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/rifujavufix.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/88268484244.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3a647dd8096aa64760d71ae34260b900/6312860570.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/88740517055.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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10928 bytes
SHA-256: 4e02d2e0918bfe656b598863c5932bfd485d504ac359b783d6272b090a593da1
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 17520 bytes
SHA-256: 5acba58b71c070ba027b6f8f750df85f2d44f7a9780d78193ef2c78dd42ec649

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