Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c95f5c90809846f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 17:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dcf9848e24fe124569800eef993af1b SHA-1: f80b7b27763be74b1282bbc9c541f1b736b92c9a SHA-256: 9c95f5c90809846f5dbb2a0355071973d8fd4f308b0d5f9cee67d5749ff6c784
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiotecnicopetrillo.eu/userfiles/files/23288753467.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/slvrr99otples1n8bdp0q3nqsj/42403482328.pdf
    • http://vdtonline.vn/static/uploads/editor/files/60127012945.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/6347592609.pdf
    • http://bmcnx.com/userfiles/file/giwulifififo.pdf
    • http://www.dean-cpa.com/files/adminpic/file/90193119185.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/denemajusefiwegare.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1c538b1a84fd315aff4454bcb6035e74/zuruwulo.pdf
    • http://tech-in.info/bramy/userfiles/file/27957592138.pdf
    • http://wadsoda.com/UserFiles/File/padijeka.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613195dbcc16c---41014260803.pdf
    • https://srilangkapools.com/contents/files/jarowidaf.pdf
    • https://salvatoredivilio.it/userfiles/file/47185248177.pdf
    • http://timecraftz.com/userfiles/file/57565858941.pdf
    • http://wiskind.com/filespath/files/20210903033324.pdf
    • https://dolupin.com/calisma2/files/uploads/bexotufedigoviwede.pdf
    • https://careersourcechipola.com/files/public/88974125615.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/vupamuzozunusozam.pdf
    • http://srub-servis.ru/userfiles/file/56208836452.pdf
    • https://wecareprogram.org/images/file/41025422694.pdf
    • http://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdf
    • http://alles-vom-schreiner.de/userfiles/file/wepelanixaninopigivo.pdf
    • https://brs.jo/userfiles/files/juropikubili.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hack+pokemon+go+terbaru
    • 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_off0000defc.bin
852ec97f179b5e9ad79c55c1cc46949df29a2a4b5d352a96cdebefd139626b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10736 bytes
font_01_sfnt_off0000f76e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16792 bytes
font_02_sfnt_off00010f80.bin
2d3cf64046f92f0fef449156d6eaa4436f9361d38f7cbb295f232f848e50f595
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 17372 bytes