Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb134261ad1061e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 20:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6db9bf68065a50f171794408fcd47a34 SHA-1: a37fbd3ad4964a0c723c6d09ef9a6a4b49c70f88 SHA-256: cbb134261ad1061e84bed8ea737d906dbc5d337c3259190d397ce3bcde2b4fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=mario+bros+64+rom+hack PDF link annotation
    • http://studiotecnicodambra.eu/userfiles/files/24560839252.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc40f827cc---91309492903.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/wigajoxizek.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d46330d121f8ed5e6f1d998ff96f710c/xeleletuzexidulekaromax.pdfIn PDF document text
    • http://rnralpha.cz/res/file/92185358378.pdfIn PDF document text
    • http://portableandcool.com/files/files/36389303926.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f0ba54f---bogowikevog.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kipuloxu.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/tobakenogu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/27895056315.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83062204659.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/dusivuges.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/soziluwarenavotivimelof.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161392d48c8c48---26495616218.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sogasi.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/8307590518.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/kereruvule.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wadibaz.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/20612398964.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/16046052472.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613360deddd02---mebezeki.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/19171242416.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109071255574654.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tunasaridejivodoxoxujavi.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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 18692 bytes
SHA-256: aa9c6e28a3a1291cb2511a2ace87c7d43ee0258d3f7a3de6537e04a6ed39958e
font_01_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 10584 bytes
SHA-256: 1d4387ed3ac7320b2d31ad8e82406da22c2765cb268d273925715d3aad59ca15
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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