Malicious PDF — malware analysis report

Static analysis result for SHA-256 305a5913bd2cca0b…

MALICIOUS

PDF

84.5 KB Created: 2021-07-15 21:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bc67004ee6fd8723d954b53cec0c133 SHA-1: f5570e01aab30af8b99eb0ee1e20eeae5fdb4186 SHA-256: 305a5913bd2cca0b1cda25ba76e0524dc7533c79a01d6f6f6e2c9664368d93b4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a tactic to obscure the ultimate malicious destination. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=paddy+cultivation+process PDF link annotation
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/10b31202c7aafbee63caf5a347a2bc35/luvadinemiz.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3dau8vob3ac69kddg3jajj7m28/bagamo.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xaledinuz.pdfIn PDF document text
    • https://unosms.us/userfiles/file/fewepawe.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/31224218242.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gamawos.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7f5b06cb0dcebfc7709c75cdc3cf7e20/63173110199.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pegetiwo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739d03c3991---badiponederuboponeri.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab36e69e---48860179300.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/24528484032.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d606aa4eb---55000334438.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59201af30---15592312405.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/48592038109.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ma43fp1colfobjaan56l8dpce1/42717479869.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608deae5797b3---fozadotireta.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/lakonejavipem.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ot1uemle3mr1muivm0it99on76/20223554845.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060616023573499.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/limoribesepi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955725592ac---70606390416.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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16776 bytes
SHA-256: 6864a92f80ba79e9288aeb260a3219ba132e3c7fe1a5356db3772f1d440eae0d
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10788 bytes
SHA-256: 1ec915e8d957f0ba793f1e55567ae5a5dfa5dad65791429e649db7b012463bc3

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