Malicious PDF — malware analysis report

Static analysis result for SHA-256 565ed45f453a4405…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 18:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1079e873fb7a5a0322125177cb23833d SHA-1: f8d49a37a31fe42c7a3873055871202d2b5375db SHA-256: 565ed45f453a4405f8bed2833e2dd1d0772af384019659148a76c6374467a012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://studiogaleazzo.eu/userfiles/files/13286063227.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed1814979---kagepakubofisivibuvaj.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/jiloruwudegerajefot.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/638ffbf227512d33c6e9d1fdf988545b/83005797777.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/40664872975.pdfIn PDF document text
    • http://unityproductions.com/upload/files/50234165185.pdfIn PDF document text
    • https://cargobull.cz/res/file/19779367892.pdfIn PDF document text
    • https://wonkingchina.com/d/files/21105221161.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xufujinizafizofexodi.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/pixaralurisumijaferexux.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/16509996829.pdfIn PDF document text
    • http://kalikraft.com/images/file/kupafugelodusokiwe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138295bbb8a0---vawovowik.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/magarudexuvuladagakumujag.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/27744172953.pdfIn PDF document text
    • https://777mto.info/contents/files/tewiwowujukibujezokurog.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/82938266530.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/saxifozimabolorajaxe.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zoril.pdfIn PDF document text
    • https://12shio1.com/contents/files/25572044167.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/61055382285.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/71025767825.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/ferebefigaxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=live+wallpaper+for+samsung+galaxy+acePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 18320 bytes
SHA-256: 3f3a5bc5df8c3c6a615c9b90bf157eab9d66a8d4e3f84eb0f74b960938a84e1b
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 11148 bytes
SHA-256: dbd3f315aa44c0b5ed08891d3bf341091092bcf3bd2cfe46c8a17088be622bde

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