Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc805b02b4366bef…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 11:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5bde02b373529666b50eb5b26f34b84 SHA-1: a5e663716979ed598b5adefdfd6401ae6ab18536 SHA-256: bc805b02b4366bef204d2cad5145df3bfbedc5d317ea42a4191d02aebb32d87d
156 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. The file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ap+school+teacher+mobile+number+pdf PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6d5af01c---82356063846.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/tozufovuxulax.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-25/20210825004207276318.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/057pm62pdugg9j85mda2olp5fb/1074015793.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa183d093---varenozaxovovakedaw.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/suropobatodod.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0556c82b---26996638008.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/20389009981.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210524150144.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/66682456203.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/35048360131.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/72345480081.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nowozoseger.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f27de547---zajidebufunebefa.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/720bedbb98138dc41a585e0f1dda5049/zuruxuvixuxalubanoxufel.pdfIn PDF document text
    • http://lscapital.it/images/file/xomekerelaxopafazaxo.pdfIn PDF document text
    • https://isleo.com/i_photos/file/93513160411.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/zoludavujiburorilosamebok.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/37065417406.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/384847316.pdfIn PDF document text
    • http://berbun.com/user_img/file/23821976180.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/titimuwalobewonoli.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536a5fa9---39673464776.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/a26269c143ff856eefd5f7ed9c194eeb/xuvepumakoruxalipuzisok.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/4154670357.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f2b5a69e---pikij.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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 17396 bytes
SHA-256: c7101fbe5eaa8be65f9c0a7a39d49272caf59151166dde09ee75987bc6ca9273
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 11108 bytes
SHA-256: 178c112a55a16411c03f2f64543300ee67b9e06d56e7f9d0d4f4e03291e2e89b

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