Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bda3ea9c416154…

MALICIOUS

PDF

90.8 KB Created: 2021-07-13 09:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9a9ccbe7e6847dd54e08f8c20d80b9bf SHA-1: b7cb98a9137eb9a74a90ac9dc090c6645fa096ee SHA-256: 66bda3ea9c4161545486ab9c580fb98a4a4adba2ecb3312d4ad358681b307be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing users to multiple domains, some of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://tz5168.com/uploadfile/image/2021/06/02/file/20210602_162656_152.pdf In PDF document text
    • http://bidmitt.com/img/files/file/64024368451.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4eea804f5---gezuroxigifo.pdfIn PDF document text
    • https://tappowine.com/file/29260065760.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c1e3fbb5---63490565742.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2d8946a4c4d2f4712ad59a24e531d77f/51191441381.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/kelesuxodamutavazopewe.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/gekidejanetiporamogi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15152769901.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vosujav.pdfIn PDF document text
    • https://ambalatender.com/upload/files/98474998892.pdfIn PDF document text
    • https://jobtiara.com/files/files/wumumisaxuzijigamojewumek.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/zazepejuluzezusarixudeva.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/latuw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc74105d9---lezox.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4147a7f71c05948e14b225256911b342/19457441924.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/k3njq79amebunnn9ld620dpa1j/25389212180.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dd578242227f2ee734cd3d16ae001114/65398694490.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609780846a686---safavef.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0557fb9f---24610496841.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/kafidoxalom.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/63079093846.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e663c0e47ab---33897429984.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lncu09uusp88a0lv0f2nhfn0p2/xaxenobit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=when+we+are+young+songPDF 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_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 10444 bytes
SHA-256: 48d3b23a3ef2d54f3800d50493ac1e6327df4c62bfadc7ca5dc16ed81a4d2cc2
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 17596 bytes
SHA-256: 244694b086855a9ac7eb8ebaa058e244e0040d6fe79bb8c4b66a30becf48f193

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