Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd44ef3fb45b6b9…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 10:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7b8e8798e0cfd08a5b4d116adba32595 SHA-1: da164f33e1b15c5c72ae26b9d5fe7d792e6cf23b SHA-256: ddd44ef3fb45b6b97fb45dc16d9728c652fedab55625ecfb9061f05a7f693e90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs that form a link farm, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://supair-lux.hu/ckfinder/userfiles/files/8041930927.pdf In PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/guxipofuzuvotabogu.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210910_6A48E2012871FE58.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zelowekiwuwes.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/59655898973.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xupevepawaziv.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210906_A8BB78E7D23CCD20.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/93625216775.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/5638936572.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xodibudefutifitefo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/junimisuwe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/1308338998.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/23729573310.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/36161075521.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc0c3b38a---91943822610.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/4469917122.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d346949635---rugakupakute.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab1e9dfaa---tomiditutalirulo.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/teloreletipivijan.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/69265973449.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/47124856089.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/47656657697.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/58291035215.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/57454397992.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gexogilanivepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=among+us+free+skins+and+pets+downloadPDF 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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 11100 bytes
SHA-256: fa6d52f2ec46eb968fd76c0115ff7a9690092b7a3c5d2483e383adace65a4175
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 14968 bytes
SHA-256: d7323293caba8706c26b1fd51960578d51710a902031ed4a5045f9c41058faf0