Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e40c3fa6926329d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 18:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb0233c37572e82c7214685d9cd8afe SHA-1: c4db53eb02ad69bdbf38cd971b1167ab1b091a84 SHA-256: 4e40c3fa6926329d33af8de29d1fd60347716606db29b7678fc6d1dcdf48f954
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document's structure and the nature of the URLs align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=30+degrees+to+radians+in+terms+of+pi
    • https://medsplus.us/admin/images/file/zolasiwuponufenibanu.pdf
    • http://plantessentialoil.com/upload/files/dajelere.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/mulolobofo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145d947b6473---38582409779.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/87800856426.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/55972647835.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/21705610573.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368fed084eb---xovuduzag.pdf
    • http://cochemical.com/upload/files/romekurixox.pdf
    • http://biancoacolori.it/userfiles/files/verobobakejibumogezul.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c520dea2a0b0cf1f7bc0e619e1d217cb/3798569499.pdf
    • http://ssatripoli.org/userfiles/file/24276615270.pdf
    • https://kaowei.tw/image/files/20210909_045612.pdf
    • http://www.sauminandy.com/fckimages/file/sefuratededefege.pdf
    • https://global-product.org/CKEdit/upload/files/nurekupamuzilose.pdf
    • http://allnatureint.com/userfiles/file/24525161032.pdf
    • http://xpeedon.net/userfiles/file/20210921025707.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tegutanesurarusijonujeve.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14054372163.pdf
    • http://altiro.nl/home/tjerk/file/2705633028.pdf
    • https://equinox-e.com/upload/files/48000019770.pdf
    • http://villabrown.it/userfiles/files/82612028000.pdf
    • http://doubler-son-capital.com/photos/files/xijosamokunaba.pdf
    • http://tsyrulnikov.ru/upload/file/2094931833.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sigasuzonobotom.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_off0000b32f.bin
796f3d906386d7cbe4b9121c690e0ecc10cd7502ba35714ec8cb94fe048e7af9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 15020 bytes
font_01_sfnt_off0000d8d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 16792 bytes
font_02_sfnt_off0000f0ee.bin
93107288876b2435f6248065bec4a4da0f49a386357e11c8c854a39fde362442
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10992 bytes