Malicious PDF — malware analysis report

Static analysis result for SHA-256 caacbb123094afac…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26110103231f27cae5c7b3a721128116 SHA-1: e8258253ea5f0a522f442612b0efa4eb62df160a SHA-256: caacbb123094afac1fba5a61ab71d17ebfd221dbe66911deb6fe489d493118df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://art-eria.pl/mandarynka/pliki/files/suwopolux.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57dbaa337f---14130929307.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/ruwezenasifexazudidixi.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/pepux.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/29761035834.pdfIn PDF document text
    • http://kleiberit.ru/files/file/sewizufebavazolibudapaf.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d969d13e---69296849181.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/72293132002.pdfIn PDF document text
    • https://ivanamihic.com/files/vadifitalizutajozagotuz.pdfIn PDF document text
    • http://learningkey.org/userfiles/bokika.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/sanisojikivejivis.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f68cc6963---wigelefaxuto.pdfIn PDF document text
    • https://limmaginebistrot.com/file/kaxanemepo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64d787b58---17646140504.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/rodetuno.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/82235613537.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9e1fc1a983b6eb725d394d688e779b02/rugemusipojiganugesabub.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5382876bd190f2d9ccbe799805e2c846/7610840161.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/okm1rnorfpjqq1c4bja529b6bb/xedalopokeposegeboraja.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/levolakikesetuxinewegode.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o2dnbst9m45b9nberv4msh8cp5/jakiboxexutatimop.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/62274294725.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/miwewomiviweluxanajesax.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/penonivow.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f28cd349676---dukalurilizinexakebiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sunbeam+microwave+manual+sgg5701PDF link annotation
    • 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_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 18552 bytes
SHA-256: a3d041e21ac177f69ee6ae1336f52647adb6c1b15ec8ec84d7d8c436f9d8a873
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 11300 bytes
SHA-256: a5bfef33cdd9a120078315f07eb5ec8b5977d92d9a39369f8de1f367e13e684f