Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2c4a0ac1c71e31…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 22:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f5028551d7999c188a71f743b9508c1 SHA-1: 02ce2c24ca89da253bf148aad8e2dcdfd7d36cd1 SHA-256: ae2c4a0ac1c71e317f68649fae7b60022946748444632de8a23f33dd8f83addb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on disposable hosting or compromised CMS uploads. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates redirection to these external sites, which are used to obscure the ultimate destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agarimo.com/archivos/archivos/89120028580.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c1de83d7a2076e02d9e98de399c53690/puxalemobekeduwemunosim.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/nusadezuxodifexi.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/18986737730.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/63775171065.pdfIn PDF document text
    • http://salwex.hu/file/27165034639.pdfIn PDF document text
    • https://designclarf.it/file/25927124138.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zivubilujalikuzed.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kezobafaxep.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132edcb634ef---36577387904.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/68184274074.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/pusubavubixezujenudosu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/3tro6qotj79cjhdte5a2ahndt5/74402587944.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/bekolosekurufoxozekazabux.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/vuzivaborupopa.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wusagoze.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/derarijopoxedevupuwovo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/96483c5256c0020811defb78dc45692c/pobewupuzoj.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/gobevidarozozuzalonakex.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/41568539018.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kujetaroxibuj.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89305048123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=scrum+body+of+knowledge+pdfPDF 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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 18508 bytes
SHA-256: 3b19f0b7c7ac857191dec47d213b048ec7c3fc8d27204c7da2d1a86f9f56a8cf
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 11048 bytes
SHA-256: 1a4e73960973e4607e86973fd530a3395d76086ef9b29078e9c718bc386f973e