Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d9f8580632468c…

MALICIOUS

PDF

82.5 KB Created: 2021-07-16 05:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 876b027c5a33a3275647c2968cda954e SHA-1: 1e2570a1052af515ab97b887467fd7ad5fea224e SHA-256: 91d9f8580632468c3a649a3402c76b9934f871c849a65feba41574285e02478c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to host and distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The file's structure as a link farm on potentially compromised sites points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4jfbgq2ink19bnt1u1j5tpu1t/98214549010.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/wiluzi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf64c9b5e0---tedujodotaje.pdfIn PDF document text
    • http://boxethai38.com/upload/file/90496798515.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/befenewepeduke.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8fc1ee0a---fubuxa.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/konanera.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/jarepe.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/82432605485.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d115cd4b83---fetexe.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/19124710615.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dufonelinilomukifetubenik.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2431f40a177cbd923a7702d18a7f2c61/91576906888.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zorekovovadifipam.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/54154536997.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h6d83c3rda57rts9seti2lsfg7/kuwilax.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/13120642091.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/94314173556.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb16d8e95d---20064355049.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99c476cb245dfd79172a6aff02b078df/62332565077.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vsboacermaig5ceci0kqifg68e/todabonifenobodavotolot.pdfIn PDF document text
    • http://zimmerei-possert.at/daxumawipulomaxivodilo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/pinitemenanerazejo.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/39932279465.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/85397726148.pdfIn PDF document text
    • https://hojoairport.com/images/file/ragip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=old+song+instrumentalPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10716 bytes
SHA-256: 31ccea43c90542295aab120ed38d0916cf4cc5d831e6fdef62370fd531049795
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17392 bytes
SHA-256: a2a6b8fe3e556810c73f05546791206a4901f6e2bfaafbe2bfa6ff4686ab54a7
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1