Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747d05ffc5d8b77…

MALICIOUS

PDF

84.3 KB Created: 2021-10-08 05:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42b810c4796b415afd81b3fd9ce0144a SHA-1: 5ecaeeb0e0260825ecafef605b793f3879705296 SHA-256: 8747d05ffc5d8b7779b56fdf48838566e4f1641d5ebdce2d470e9866c64f5543
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://upservice.expert/admin/ckfinder/userfiles/files/51610111359.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/40841715152.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bsr6oji51rmchrlfpmtmamguo6/jobaxile.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/dufiwudotatapela.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/56943005985.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/8722177373.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tr7lsbp47dvkudg2q9an3i9uv1/53483753197.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/jumewipuweki.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412030b02f4---7357588867.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/68885750959.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t8gkmpi2a1nn8i3dffgbli3nv8/65013554684.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/golunujomuzaludu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161483c6698a17---61043274928.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/seredejamarov.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xezigotomemipuvet.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20211008055242_2095345327.pdfIn PDF document text
    • http://schokofontaene.de/idata/64041900035.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/87772903389.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/bakogimiguraje.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/bapagevunililufepuforuli.pdfIn PDF document text
    • http://briztravel.com/upload/files/70478911728.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/13240299775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=american+shorthair+orange+and+whitePDF 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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 10836 bytes
SHA-256: 647a1ea6008b0a938f0e8d5503ae2826660ec8409221eb17f89148cf68bfa6b0
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 19940 bytes
SHA-256: aeda05e50c12217ecfcd5d95e64049fcd83e91c647b6117f8724b44e7c593dae

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