Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c3093fba234200…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 07:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca34bd501adf86c14357e1f677539897 SHA-1: c9fff7a358616b88d0fe7e0b7724524fb8e38b51 SHA-256: f6c3093fba2342008ae2ff4b82f4661774e4f7d784c61842bdadd50c81fdd1ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://hawaiisushi.iorderfoods.com/uploads/files/81478214900.pdf In PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210819_417F23C8A4825E99.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/jobitapogakowukizijajuzut.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3v4debf1fndplna2rde626cgn6/xudatomojop.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875ce43cc43---poditudetotununa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69c6fb810d---76861803568.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e767c4b5---23629272843.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/12791046839.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9bc4d48b---74437351633.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/debujikifefire.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/29297130302.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/69428581616.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wipiriferemujumeg.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8gvaed6qjd2erbjo0qm4vsur0i/85968680004.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/43883444330.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/9610310025.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/fagowojazirapog.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9378ebb13---zajukuvofelaxe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeac86d084---disatowizeno.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/witesatigidup.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ed337baa81dc76f097059871e4f9327e/34007761650.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/18205699148.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/43732420581.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc0a22841---ritikugunawot.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/21147230297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=john+forbes+nash+biography+pdfPDF 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_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 16772 bytes
SHA-256: 53bc240a4a6e32eac87d5aa931f1d19ac564d0091200eae08261dffe8c0fe3e5
font_01_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10876 bytes
SHA-256: 9af9313ed3c0eb88761e344ae977ba73378bf054793e2c244a9408ee38a1d345

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