Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50fdfa77353b909…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 00:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76c59e8c9f8b1626b06f2ed1029766c9 SHA-1: c5d23212038c3a067b90d88ccb7e4b7893419996 SHA-256: d50fdfa77353b909bb4f1ced510fe4878020cfdf2f7ec2c332c7250ca9f536ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware. No scripts were extracted, but the presence of numerous external links points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://vimar.ua/userfiles/files/salamubeminojuxado.pdf In PDF document text
    • https://homecareangels.ca/files/files/files/28794650592.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/088b86971581a8207d7d794fe7809142/fonakokol.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b69d2b88b8cd5bdeb0fb106a4c9e6e3/vixosinajulipaxegokaluma.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/73881900970.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/kijalerepoxidozuzi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/79521167195.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4327225848.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f2d5dbbdb---funekoxipegebejigonovum.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/61rp0o68somi8fj8oalku0qk91/41970362419.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2aed0a58e6370eac62e70d88491990ae/17971611589.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/navuv.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/10789707944.pdfIn PDF document text
    • http://vucert.vn/uploads/files/57738776405.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tanagalamabiluwazeko.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d4665343---39593578362.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/61909527225.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/37767802162.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09388c4ba---xiteninapabepizelolodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=frigidaire+gallery+freezer+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6e82ed76e---44471104643.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_off0000ba9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16784 bytes
SHA-256: 758d1c2f4aa4a142942ca290752474e63e413a272a2dd8f2b8f1b789ea686c27
font_02_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 10564 bytes
SHA-256: f45e2ce45130e27a6b6a994f8c9c7b8258c16f154567964f930ec834e9723452

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