Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f6226145ee55b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 01:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c86b154ac8d7e40a8bf3df53176111d SHA-1: f3a8c5cfcf91b915be3bfefd422e19c76a7aa403 SHA-256: df2f6226145ee55b4cec057250f5397b6c9b80adc1ad551d498aba7b5b56d1ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple disposable hosting domains, suggesting an attempt to obscure the ultimate destination or to host a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cd70f0e2d6be2c3849bf6232f1aa76ab/76020976084.pdf In PDF document text
    • http://avtokit116.ru/!upload/files/resirobidejonuzov.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210915220932.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/52130007491.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/50043814248.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/34317157363.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/90319794407.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614982f922368---29818732751.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/9424985309.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/82659023710.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/26744333443.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109240542233384.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613452756710e---88775991715.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/tedugukatel.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/sulutemibokasuf.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/18509306185.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/svc3qudfcfb21b7p2dks18v321/raxisukubipijukazibege.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22466909017.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/jovugavejepewerozot.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43978570115.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21971266225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=where+can+i+watch+train+to+busanPDF 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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 10600 bytes
SHA-256: 655b310f0090f0a6360c53821d0bd17cc8eda8626cf188a69ec2537ae77af0d5
font_02_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16744 bytes
SHA-256: d4a091fc93baaad411853810d49835b3d2ae9da76bf2f26640d4780d44df8c5c

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