Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b2924effca405…

MALICIOUS

PDF

74.9 KB Created: 2021-06-27 23:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ebcf622e03f53ed288c3db1c253908 SHA-1: 472206fb26a7e5d481d8b7b8150661999f521f9d SHA-256: df9b2924effca405146286035530f48d79d7829c47543ebf76f2e6e65d850c3f
156 Risk Score

Malware Insights

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

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, directing users to multiple external websites, many of which are hosted on compromised CMS upload storage. The presence of numerous links, including those on disposable hosting and potentially malicious PDF files, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba6477b63---sulumijewebujusedupemazug.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c6b3f667---62889572097.pdf
    • http://metallpress.ru/files/57000442606.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/nuwosavutedetotoruzakev.pdf
    • http://gorisum.net/fckeditor/upload_file/file/22917773255.pdf
    • http://gianniarnaudo.com/userfiles/files/52578907238.pdf
    • https://luyenthitoeic.info/userfiles/file/90691320358.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jqr2nhbbok35rrpq9ml9lgm9g5/46776309102.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cc2332d---parogavigonuliloxaj.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/vuwasebazulejipop.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/04c69cc47c4eb4fd46430da03bf63a5a/soxikolusulupimuvisuj.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/os6lruu5tjbj87u6u8p2bcukbo/57062169931.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3e8b8ffa50088159a8d8a533f91054eb/tefebudaza.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160720aaf0cb8f---bisodedafuxu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/150a5c45448ed47840935fb265f16e3f/koladebuta.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b696aa3b88c---55357929861.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7564fb0093---44917285162.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cqd9eh0slh2f4teqjrh31nhvt6/vemunefog.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a36e3f0---luzokuja.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9c8f4b9c5a18b4dd1e39059cad9a74d1/19629805434.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7cd9893b---juxukerogepuri.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/wiwagirovixamugiliwabivib.pdf
    • https://247christianity.org/fckeditor/userfiles/file/11705147551623473905.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+determine+if+an+equation+defines+y+as+a+function+of+x
    • 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_off0000c117.bin
640e1c4177646aee9bfc13d1c279ebf140142bbd599167215bbfc4567b978b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 11132 bytes
font_01_sfnt_off0000daec.bin
0cb8c78354643f69858112f8f9790b90fe8c09099334bd450c3a10dc039b6da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 16380 bytes
font_02_sfnt_off0001059f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes

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