Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46aaaa1ac818ede…

MALICIOUS

PDF

80.7 KB Created: 2021-08-15 21:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13f0eebec945b1a0d707132da7edec92 SHA-1: 689a5841c3434c50987a396b63c9ecb603bfed63 SHA-256: d46aaaa1ac818ede44a1fb8c235e59b3faca0148aaa350d7fe7694cd3fa3f692
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on potentially disposable hosting, supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://brilsports.ro/userfiles/file///46688136486.pdf
    • http://www.greenfield-sustainability.com/images/files/47341166424.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gbvsr023keqsi2g442hkcf54e0/47519348122.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/51fc76160a00f7f13d1b55d74ac6d706/liroxivoso.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/gejemipafelapura.pdf
    • http://centreforeffectivecoaching.com/media/file/xatudopijap.pdf
    • http://kaymccarthy.com/immagini/file/dasuloniwu.pdf
    • https://techson-cctv.com/upload/file/moxirobav.pdf
    • http://instandee.com/Images_upload/files/jupokenopepefebezurejus.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea37952ef---nazaranimuzofubobaxupi.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/73383082072.pdf
    • http://papinchess.ru/userfiles/file/mezepefefu.pdf
    • http://denkobarbell.com/_upload/files/62431402873.pdf
    • https://contact-house.com/fckeditor/upload/file/lanadafimogiletewagijijeg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849839d1d5e---gobamu.pdf
    • http://gorisum.net/fckeditor/upload_file/file/gisaweziranosivotoluxafi.pdf
    • http://railwaysrailroads.com/upload_files/files/12225509636.pdf
    • http://velocimapper.com//webfiles/file/wejatidovologixowavezof.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082724d6d69c---bovoxibidipejegata.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pictionary+cards+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_off0000d915.bin
9cfe846fda1c708b253ce9e36ccaa4c5da62539dd4cbdc311414ddad4600263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 10548 bytes
font_01_sfnt_off0000f14c.bin
1d126bcd9bad983a1e9fdced7a2f1052e3164a43cb4fdfec5120ce9fa271cd58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16608 bytes
font_02_sfnt_off00011c9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes

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