Malicious PDF — malware analysis report

Static analysis result for SHA-256 617dfd9a9788ab15…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 14:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4bc0923c66d7dd582e6db8e2d15e53f SHA-1: ae92a9da22e6f8703e1e2d449a7998ac2a41a135 SHA-256: 617dfd9a9788ab1575a10b3dfcbbfd2c686078d62eccf8b8d715241503974e46
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in malicious distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=nordic+track+users+manual
    • https://ntct-dz.com/ckfinder/userfiles/files/93151928740.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0351c8b9b---74673797492.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/516aabee89f743800cc537d12fbb7790/fuvewo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fa2d277eeaa88ff1685789acb57e584c/xasuvurax.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c579138dff8---79064026268.pdf
    • http://sanga.asia/userData/board/file/1300711092.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca5a658b---lisovuvajuxaw.pdf
    • http://alexlunacoach.com/img/editor/file/90084554391.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/54101633714.pdf
    • http://btc-ltd.com/upload/file/kenosefiverekexili.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084e34e3073a---48743589285.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxaluvobipupi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9424d6e2d9---75872061945.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16078c0527b591---43972027686.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5b90fb10---lafizawemakebokef.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7ea9760b872e7c03f75374d68af9c8a9/27978138743.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/30f4d31b32eb6dd22d885b284450645e/65121833260.pdf
    • http://sxcec.org/userfiles/file/2088796826.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_off0000fcea.bin
a578ab39a46cce0fdea553cc312719e5558c14d9553ba177bad267062cb2fcbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 10700 bytes
font_01_sfnt_off00011574.bin
5c888a8a5c9b2db5e3f7de44acdf63cf4cde1b94ce1d59a36f483b40303e41cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 17612 bytes
font_02_sfnt_off0001437e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1437E 16792 bytes