Malicious PDF — malware analysis report

Static analysis result for SHA-256 f044d8283e3f43a0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 12:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d98f2d8ffb37cc4400e49fba77479310 SHA-1: a954886aa8f5ce9f0e54fb95c773bc031a51ac01 SHA-256: f044d8283e3f43a0204181b917335e788154091e54cb187942b3b78e8f6a688b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate effort to host malicious content on a variety of domains. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=download+fm+radio+apk PDF link annotation
    • http://meskerjager.nl/media/files/xovanar.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/8614988360.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3lbqhfqa47botbgf97lr32901a/vawowuvo.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210917_ED38AF0FAA193EF5.pdfIn PDF document text
    • http://neteyes.eu/editor_up/biwez.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/sinig.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161415fa07908e---mavetizuwozobax.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/dobidenaxuviwurojalawore.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/2173643886.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436970163ae---jaweguwijiso.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138612fa1d78---40065469772.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210913131611.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kimoxosaxedikofaxotofo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nedagit.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109161638348986.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413879ab6b7---vupujoxudabiseronitowujef.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/74891028353.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zamaxozixesekuk.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/poxedubak.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/76647075880.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/zapasaz.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/60789784952.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/38877146177.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bijumolanirere.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143083468863---65637499635.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_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 10440 bytes
SHA-256: 29de5f02eff6f576f0afe864a2a9467741757943866682a52672a576fb98e8b6
font_02_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 17632 bytes
SHA-256: a6f38640c16feb35377e0db449fdc3f06bf28e505e5c5a5972c89cac6ba1585a

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