Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77417f7b3a448d3…

MALICIOUS

PDF

75.3 KB Created: 2021-08-11 15:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f9374fcaa99b40df6239ab9c6bdae98 SHA-1: ec9ea679faf7b8f6c10dda0f79e00d8ab283f648 SHA-256: e77417f7b3a448d3370432d4e06f93fb7b40f05d86349f72e6598350f2db0c90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are common for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=trabajo+social+de+grupo+ezequiel+ander+egg+pdf
    • https://manenshop.com/upload/files/77345569805.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/40bc4e3d474bf2bcae81fa47d065a063/46794582619.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/nixiwikiwodewovo.pdf
    • http://a-swiss.com/upload/userfiles/file/purotopafoveso.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/zajore.pdf
    • http://ipsgroupjjn.org/userfiles/file/98361322230.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/90292743457.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160992dae12893---kutibuwuwowile.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/75cc9n4da57587vauhp0a3l9br/munebaxu.pdf
    • http://atol-res.pl/uploads/file/48250842669.pdf
    • https://clubkdo.fr/img/pics/files/66748488136.pdf
    • http://mobilenmr.com/files/files/dajakimo.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/31106686845.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3hf8g1kude2dj5951kegv1seg2/pizafikokudelusam.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c606f08064e1912e188c23d41a490e81/91585091377.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00e0dcf433---25955919387.pdf
    • http://reelproductionshd.com/userfiles/file/3912257725.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bb247464626---58504128805.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8d18f48d7061da2093bb2595ed65a2e2/58794412477.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/5322537764.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812681da8ac---93751805163.pdf
    • https://virtrade.gr/userfiles_lybo/file/73865301613.pdf
    • http://nomorecpapmachine.com/userfiles/files/29925645782.pdf
    • http://csim.jp/ckeditor/uploads/files/46246791342.pdf
    • 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_off0000c0ed.bin
2bca31feeffa5f9afd78334cd6a3afadfd5b493d34aac6e56efa4f1005d8e1bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 11236 bytes
font_01_sfnt_off0000daa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16792 bytes
font_02_sfnt_off0000f2b3.bin
711ef2e0ddaa56ee33a5c971cb60bce97edade9cd914c4b60aabbb5806fa210d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16988 bytes