Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cdbe5d5a0e3d17…

MALICIOUS

PDF

94.4 KB Created: 2021-07-04 16:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f24276e6f93e99e6cca33ac80864131 SHA-1: e9a9172ab581013c2be7acab50df0b9c164fa5b6 SHA-256: 88cdbe5d5a0e3d17c414eb213f7c312c0b86c00c6fa7308bf1b56e587cfa996c
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 phishing attempt. It functions as a link farm, directing users to multiple compromised WordPress upload directories. The embedded URLs are designed to lead victims to potentially malicious content, likely to harvest credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b23c6e20565e1c31c25699191b9afeb5/desalubuwefejanekawe.pdf
    • http://thuexe7cho.vn/upload/files/12828609368.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd54041f0---1619712322.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad06be9e692---bopagivogak.pdf
    • http://royalgoodviewresort.com/Uploads/file/5444186300.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qj62lcu0p6js3h23uel7e3fsvg/75371923080.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45acc0af76eaa24f28c15e906d20513f/7937551732.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7d85feff68892154c3b72c2c47a790eb/77081758990.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/31957e1672435e0c009d6e9115fcc32f/82113878375.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/k3vtf6cjdt4jn981jcgat4mb5e/57595125465.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7eba4c2b219c1adeddb17a9bbc942124/55687951470.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160896c0c37c7b---16529838085.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pum04g3froe5brqsf1cvhf0i7j/31285928592.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/31648305513.pdf
    • https://focaccellini.it/file/dufinuxujixuv.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cad28b1b949---radamugenol.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9893e25f0---47919251090.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83694821961.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd57de019---54691998889.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ler0rhsb5kjed1v53p424b31nq/gumimetep.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xironesijo.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/94996762999.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef157a1612---10967931483.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bdad9d97---bokelez.pdf
    • http://marketypik.pl/zdjecia/fck/file/xekifidujoveked.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=milldale+cottage+company
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16792 bytes
font_01_sfnt_off00010fbd.bin
ba49835c8e4d922b3ec83c5602a231c463ca7c1ef4d5136f3ff6d3b3766a955f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 10696 bytes
font_02_sfnt_off000127fe.bin
03c0d09f1748fa708a3b16272f6acba8b50e3166565f3bcf5cd74175016e5a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 17780 bytes
font_03_sfnt_off00015668.bin
6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x15668 16100 bytes