Malicious PDF — malware analysis report

Static analysis result for SHA-256 174e351fa68ebed1…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 912d6623fa54a0cac6290a25492fd06f SHA-1: 33603c9a0955b47be82d739ce062eb09c09df645 SHA-256: 174e351fa68ebed16656680ba644c7ea79b31fba23079cb4ab1a1815ec37b1b1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://crewmak.ru/uplcv?utm_term=art+leap+app+for+android PDF link annotation
    • https://nergizleryapi.com/image/files/49197492992.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/salulitixubijuv.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c93ca1a864---xaxokukisawaje.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/sipaxapagetigo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/53839528374.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/migasexen.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/365739040.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/87669650436.pdfIn PDF document text
    • https://kawanmto.info/contents/files/69901639626.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/viwusiwedudutagisaladozi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/56a8770a2b54e0278f0a0f5c025d7f39/41881480228.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/zakebigojajimir.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0009e3c0668fddbe3facf4922f8b0002/90625968419.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nomepigazimapimolagor.pdfIn PDF document text
    • https://esz.jp/img/editor/files/bakevekuwemisidevelun.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161491055733d5---zikozafax.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/jixuvuzazapexugiwijeto.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/tunolezuwavogemor.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/83398683225.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/nufula.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71943580635.pdfIn PDF document text
    • 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_off0000add0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 10304 bytes
SHA-256: 236f9c2e38ae6c4106279268e1eed25213cf57664bff9070c6026daa5bff007e
font_02_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 15012 bytes
SHA-256: 672a41cd0bb966d0888268b544370615ae55d8a1a6cb7c836541809727e8a1b2