Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60e4e155d9e3002…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 14:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a268a4f33ad0ff616472a537d6939590 SHA-1: 279a3a3fd8c7d3da64864bb53d34af99b2446eb0 SHA-256: a60e4e155d9e30029ead2acda30d37706aafc98f73ececa428a68c2a5f74cbf0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chaletsuenodesol.de/files/6182805898.pdf In PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/75888955323.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tojojuxexifuzanoweku.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/modej.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161341ddf72374---vuluxogijidabiragidituj.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/dujakibexomulinasekonijaw.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/55480656212.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/39474595726.pdfIn PDF document text
    • http://rnralpha.cz/res/file/92185358378.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/peginodevawofuvotiz.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109011051043052.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c270a810c---83077827890.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/60821663147.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147edfbebec7---xijerupejutalojuni.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3n3hr2oqvq15t7cm8qr5n09cl2/98592615553.pdfIn PDF document text
    • http://berbun.com/user_img/file/revokatexofebajope.pdfIn PDF document text
    • http://chinazzjx.com/d/files/rajod.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/loniligixusilevuxe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/186a387c6d87666e5ff00de094a5f5e6/59168718466.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/52297813031.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lakesozuxuwobu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/2625799868.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/26346169115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+3+quotesPDF 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_off0000b4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 14440 bytes
SHA-256: e5a6634d38b9245b8e9553d53187e845d99019150a58f9e94e7159d9872ad909
font_02_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10216 bytes
SHA-256: b5e42ac2263abad45ab9e4e84fe8dd78bb425a050079db7be3c5af21f22aa532