Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f09c4514c6abd04…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 09:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43e90007c318cba07283c72c27312326 SHA-1: 6f969f0a3cea080bb1f43ad4d0616a7c62ae662c SHA-256: 9f09c4514c6abd0431bdcb632f71343cadd5ec0914342070859a1fd47b1b3000
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. The presence of numerous links on potentially compromised CMS upload directories suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2nrp189iie67alkm9ogh1tabvr/vapusiluwojenadaberofolej.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f3jg9s5t9gd59ub58h875h8usu/61956012349.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4422cd1f4---berezafonufibi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934236cf2b---vetudifuzene.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8837b79a8---35047326340.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd71893e5---mumezadetenezasomujisojo.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/71o3k6lqqv12k2c3gavh530h6k/tifuvajebetapibenemunis.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1a59c4db6372c374cd6b1258eb23db7d/xaxixemivevojopireri.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j1b5q6e482b94h94uiohgtd402/31226176324.pdf
    • https://artasedanasingaraja.com/uploadfck/file/begapapunarigu.pdf
    • http://whs1979.net/clients/65916/File/89058463315.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38df1a752---21953612433.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kobowulixizijapeji.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/cf7b96931e0ee8dd2e07d3fdabce8ab9/putidepunib.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/tagizemeboraw.pdf
    • http://retco.ge/ckfinder/userfiles/files/tebosetovokevexoxevu.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d146dff4c2372be567e0d6364230417/60108807597.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/43788900269.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0612659e2---23323442310.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210614001956.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b2314c07---41271498618.pdf
    • http://vce34.ru/attachments/file/nizometabidopemikasi.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1f64a2c2---pobag.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9311929b---zofilegotun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=green+day+american+idiot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin
0c1d7e51bad2a76ad51ec4e1f62a69f5cc0894474053c0a08c907b280c253e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 16920 bytes
font_01_sfnt_off00011384.bin
8b73ab0fde53cc376b5855ba92ac2d1758a56b74a0295120c2bcc5babe145ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 10472 bytes
font_02_sfnt_off00012b54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 16792 bytes

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