Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2b9bec6c5c9e63…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06d18564541dcd4d95911f6b2a381249 SHA-1: bce609ba36e1d04ccc72d26b23dddf71398073d9 SHA-256: 4b2b9bec6c5c9e6330a0881a5f4b3f99a14b7c18e4b32e04c3496f81264c4e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that redirect to various external sites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are intended to manipulate search engine results or lead users to malicious content. While no scripts were directly extracted, the nature of the link farm implies a phishing or malware distribution attempt, likely delivered via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skrabl.pl/www/rpbd/fck/file/wowasi.pdf In PDF document text
    • http://slovbau.sk/test/userfiles/file/tusaranupagudo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd356a71c2---6849223615.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ee972aa4349fd867162002c6b0b7e836/togiku.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/76047806031.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/ligexufinexilarobizuxug.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ecf2e397---65196695001.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df62d44fba4---derujoleledibegogugi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/cf4rsgnr1v6g38mnun9t0ecuk1/dijaxitenigimevinisagibu.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/novesujusiredudelubovov.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810465d5129---puzukapiwu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/malugarugufejesasu.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/xuvozefofurisakipuzim.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/gibujek.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/kinosesepu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/oe5okbm97bcn2u84sm1ddboi7d/83438685447.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e5eea2c3---6872643976.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1902297fde235f9c509442c686db6a39/borirobag.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/91854708700.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8855psin7obdubsa0cp63cbpb7/18274841133.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/vukolagirawovavepedoketat.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/xinop.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/45525253779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=production+technology+op+khanna+book+pdfPDF 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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 18556 bytes
SHA-256: 1a23a8911265f7c6fa0b8329054e09825e3e0ce6d0ad29bc7af9eea37310ea53
font_01_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 11176 bytes
SHA-256: 6de91b6c828f891f8ef84a858c12ce1c06d201ee2dbd67fe027a0a871207a3ec

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