Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb27be03f96e85d…

MALICIOUS

PDF

91.6 KB Created: 2021-09-07 08:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d649b6af6fb2a18c89ddf633d72a3a81 SHA-1: dd07b1dc8fb6ff53e4f3a4d82768ceea4ae5efb2 SHA-256: 3cb27be03f96e85dc02a2202750b2e31ef4f6f6629407024228af0389ff8f2dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rhkipk8u5bt2obt5o9rsc6nn23/kifomevebawodasadakul.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8df70ca531ea5c6c6ede168bfdc3efbf/vemusikifekaxojakixosexib.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35ee68a34---70917560205.pdfIn PDF document text
    • https://activepymes.com/pub/file/55733149184.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/60eedb0c8a02ab1115a57bc7cc19ac66/69571040020.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/87d693cf56e4b6154038a47db1b54fb4/vuduzadexojevipev.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kotewatafipij.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wikipuki.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/de4aee56867b0259f647f3ec3b6e6bd4/69949673501.pdfIn PDF document text
    • http://didopack.com/files/xenufed.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/71d83bbf9ba594adb428e1d385c13aeb/73536071441.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/68112217688.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161245353984bc---liwipo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074540712111---gajunasor.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210713125424.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/rifutotutomiruniniw.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/99036743004.pdfIn PDF document text
    • http://turatabor.hu/media/kovox.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/xefogav.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/20498064942.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a80efafe2312ea0588b1ac36e61844a5/22117735604.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/kuvavafepotor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phantomjs+pdf+exportPDF 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_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 19112 bytes
SHA-256: 80ac0dfb6621983b39fe15a15c755584daeaef78c99aafac087d500754f1128b
font_01_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 10856 bytes
SHA-256: 7e7939208bc011ef9556ce6a2873b419d965695bd0d92693b8e050c5291a98b4
font_02_sfnt_off000148b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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