Malicious PDF — malware analysis report

Static analysis result for SHA-256 80de24c8af0d6135…

MALICIOUS

PDF

84.1 KB Created: 2021-07-21 04:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e135939ec6017dc7dd350f8590065486 SHA-1: 3dbc948a61d07eea2fa54115c86ad7d190e0c3d9 SHA-256: 80de24c8af0d613509ed0717851de5a96b138e43e4153d3c6d3a5583c65e5b24
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript and the extensive link farm suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c2c305664d044c9e8513a0189ecdaf3/pinabokazesako.pdf In PDF document text
    • https://doitoutdoorz.com/file/44wA3GzrPky3oQbM.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/pofegavudodudusale.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rofuf.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/59764072226.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/xelebererozovotejisuverel.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/mowik.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4da1a715d---70229757440.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a135934b67681180bf6c42fde2cdbf3/91003315843.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160895cd33ab78---75350046006.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xopobijenadowovuzug.pdfIn PDF document text
    • http://delve-cr.com/uploads/gadusajufewadubasikedos.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/10421942791.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca07601bc3---22262321455.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8e0011e3---pebapiretuzeludalezokul.pdfPDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/gumikebopojapeda.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927e169490---96234890864.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074900381ad5---kazudewegetugiwotagogugi.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xutixetapumekegewekiri.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/32677451010.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/mireve.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b7d76b06b97cdede58be5e4dfcb62dcc/25840825046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=articles+on+labour+laws+in+indiaPDF 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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16712 bytes
SHA-256: 401f35b412dd7cb344583aaacdedfc34a36bc3a3cc43e809f442538b5441f0a4
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 10668 bytes
SHA-256: 50b1b3077642ab39ee388baa1d78ab22f8f9fe81113ae128c832ea7c69c751a0

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