Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff1e0564c920b1c…

MALICIOUS

PDF

86.7 KB Created: 2021-08-22 04:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a02a3e0014f3853a6fd51d8b04fa3cee SHA-1: 0c25e0736fb0bb60fd84817c26b3b63d733259a4 SHA-256: 7ff1e0564c920b1cfdf209c7edf414980ca63f0e79d0a11ebb622ec58550d451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm hosted on potentially compromised or disposable domains, suggesting it's designed to redirect users to malicious content. The embedded URLs point to various subdomains and paths, likely part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krasneclanky.cz/uploads/96608675581.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0da1b906d3395865182eb34f701e21e5/subujiguf.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb750870d---bubabavinajariva.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/47883022716.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f67a26fa---jofarenubeseni.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/48a1mvg5ccvot1e1kpha803an6/rewomoja.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b879805600---fivibo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a770983e6af38f72c1080857a0b560d6/63104843842.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vejiboturusorajinoxipun.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/22912659450.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/jexopisifafekugolaveroj.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d5746a5d---faxob.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b4404438c69d8852a5040a4bf659945d/famijaxivelibimunozaj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b10cb135287face9f1f71f2b60f33d36/figeraridenozuvubis.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bd4e3a9---geralinebofapixupazi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e927b6c35---fexuzewurote.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oo86tllflcm4pevn81742gh7rr/39979749032.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/50462575809.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-26/20210726124308186507.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nojipopo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efb8576ec---dagusujaleg.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/68586626590.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/sotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=inteligencia+emocional+en+los+ni%C3%B1os+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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 11020 bytes
SHA-256: 951040658a8a8f5f25b8a9ac94a2c2a58765360c9d3de3c5bee037c6e72d4afa
font_01_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 17852 bytes
SHA-256: 69f3876eb9c453a3161f4125b9500a8cfa8e7c1c255c99520304158b4cf6faf1
font_02_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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